Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices

We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlat...
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Autor*in:	Filippo S. Boi [verfasserIn] Ayoub Taallah [verfasserIn] Shuai Gao [verfasserIn] Jian Guo [verfasserIn] Shanling Wang [verfasserIn] Anna Corrias [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2021

Schlagwörter:	HOPG Graphite van Hove singularity Hexagonal superlattice Negative thermal Expansion

Übergeordnetes Werk:	In: Carbon Trends - Elsevier, 2021, 3(2021), Seite 100034-
Übergeordnetes Werk:	volume:3 ; year:2021 ; pages:100034-

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1016/j.cartre.2021.100034

Katalog-ID:	DOAJ001895036

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245	1	0	\|a Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices
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520			\|a We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices.
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650		4	\|a Graphite
650		4	\|a van Hove singularity
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650		4	\|a Negative thermal
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653		0	\|a Chemistry
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700	0		\|a Shuai Gao \|e verfasserin \|4 aut
700	0		\|a Jian Guo \|e verfasserin \|4 aut
700	0		\|a Shanling Wang \|e verfasserin \|4 aut
700	0		\|a Anna Corrias \|e verfasserin \|4 aut
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allfields	10.1016/j.cartre.2021.100034 doi (DE-627)DOAJ001895036 (DE-599)DOAJ3b906650efc8463589428bb3e8677477 DE-627 ger DE-627 rakwb eng QD1-999 Filippo S. Boi verfasserin aut Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices. HOPG Graphite van Hove singularity Hexagonal superlattice Negative thermal Expansion Chemistry Ayoub Taallah verfasserin aut Shuai Gao verfasserin aut Jian Guo verfasserin aut Shanling Wang verfasserin aut Anna Corrias verfasserin aut In Carbon Trends Elsevier, 2021 3(2021), Seite 100034- (DE-627)1752948939 26670569 nnns volume:3 year:2021 pages:100034- https://doi.org/10.1016/j.cartre.2021.100034 kostenfrei https://doaj.org/article/3b906650efc8463589428bb3e8677477 kostenfrei http://www.sciencedirect.com/science/article/pii/S2667056921000110 kostenfrei https://doaj.org/toc/2667-0569 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2088 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4393 GBV_ILN_4700 AR 3 2021 100034-
spelling	10.1016/j.cartre.2021.100034 doi (DE-627)DOAJ001895036 (DE-599)DOAJ3b906650efc8463589428bb3e8677477 DE-627 ger DE-627 rakwb eng QD1-999 Filippo S. Boi verfasserin aut Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices. HOPG Graphite van Hove singularity Hexagonal superlattice Negative thermal Expansion Chemistry Ayoub Taallah verfasserin aut Shuai Gao verfasserin aut Jian Guo verfasserin aut Shanling Wang verfasserin aut Anna Corrias verfasserin aut In Carbon Trends Elsevier, 2021 3(2021), Seite 100034- (DE-627)1752948939 26670569 nnns volume:3 year:2021 pages:100034- https://doi.org/10.1016/j.cartre.2021.100034 kostenfrei https://doaj.org/article/3b906650efc8463589428bb3e8677477 kostenfrei http://www.sciencedirect.com/science/article/pii/S2667056921000110 kostenfrei https://doaj.org/toc/2667-0569 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2088 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4393 GBV_ILN_4700 AR 3 2021 100034-
allfields_unstemmed	10.1016/j.cartre.2021.100034 doi (DE-627)DOAJ001895036 (DE-599)DOAJ3b906650efc8463589428bb3e8677477 DE-627 ger DE-627 rakwb eng QD1-999 Filippo S. Boi verfasserin aut Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices. HOPG Graphite van Hove singularity Hexagonal superlattice Negative thermal Expansion Chemistry Ayoub Taallah verfasserin aut Shuai Gao verfasserin aut Jian Guo verfasserin aut Shanling Wang verfasserin aut Anna Corrias verfasserin aut In Carbon Trends Elsevier, 2021 3(2021), Seite 100034- (DE-627)1752948939 26670569 nnns volume:3 year:2021 pages:100034- https://doi.org/10.1016/j.cartre.2021.100034 kostenfrei https://doaj.org/article/3b906650efc8463589428bb3e8677477 kostenfrei http://www.sciencedirect.com/science/article/pii/S2667056921000110 kostenfrei https://doaj.org/toc/2667-0569 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2088 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4393 GBV_ILN_4700 AR 3 2021 100034-
allfieldsGer	10.1016/j.cartre.2021.100034 doi (DE-627)DOAJ001895036 (DE-599)DOAJ3b906650efc8463589428bb3e8677477 DE-627 ger DE-627 rakwb eng QD1-999 Filippo S. Boi verfasserin aut Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices. HOPG Graphite van Hove singularity Hexagonal superlattice Negative thermal Expansion Chemistry Ayoub Taallah verfasserin aut Shuai Gao verfasserin aut Jian Guo verfasserin aut Shanling Wang verfasserin aut Anna Corrias verfasserin aut In Carbon Trends Elsevier, 2021 3(2021), Seite 100034- (DE-627)1752948939 26670569 nnns volume:3 year:2021 pages:100034- https://doi.org/10.1016/j.cartre.2021.100034 kostenfrei https://doaj.org/article/3b906650efc8463589428bb3e8677477 kostenfrei http://www.sciencedirect.com/science/article/pii/S2667056921000110 kostenfrei https://doaj.org/toc/2667-0569 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2088 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4393 GBV_ILN_4700 AR 3 2021 100034-
allfieldsSound	10.1016/j.cartre.2021.100034 doi (DE-627)DOAJ001895036 (DE-599)DOAJ3b906650efc8463589428bb3e8677477 DE-627 ger DE-627 rakwb eng QD1-999 Filippo S. Boi verfasserin aut Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices. HOPG Graphite van Hove singularity Hexagonal superlattice Negative thermal Expansion Chemistry Ayoub Taallah verfasserin aut Shuai Gao verfasserin aut Jian Guo verfasserin aut Shanling Wang verfasserin aut Anna Corrias verfasserin aut In Carbon Trends Elsevier, 2021 3(2021), Seite 100034- (DE-627)1752948939 26670569 nnns volume:3 year:2021 pages:100034- https://doi.org/10.1016/j.cartre.2021.100034 kostenfrei https://doaj.org/article/3b906650efc8463589428bb3e8677477 kostenfrei http://www.sciencedirect.com/science/article/pii/S2667056921000110 kostenfrei https://doaj.org/toc/2667-0569 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2088 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4393 GBV_ILN_4700 AR 3 2021 100034-
language	English
source	In Carbon Trends 3(2021), Seite 100034- volume:3 year:2021 pages:100034-
sourceStr	In Carbon Trends 3(2021), Seite 100034- volume:3 year:2021 pages:100034-
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	HOPG Graphite van Hove singularity Hexagonal superlattice Negative thermal Expansion Chemistry
isfreeaccess_bool	true
container_title	Carbon Trends
authorswithroles_txt_mv	Filippo S. Boi @@aut@@ Ayoub Taallah @@aut@@ Shuai Gao @@aut@@ Jian Guo @@aut@@ Shanling Wang @@aut@@ Anna Corrias @@aut@@
publishDateDaySort_date	2021-01-01T00:00:00Z
hierarchy_top_id	1752948939
id	DOAJ001895036
language_de	englisch
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Boi</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2021</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). 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callnumber-first	Q - Science
author	Filippo S. Boi
spellingShingle	Filippo S. Boi misc QD1-999 misc HOPG misc Graphite misc van Hove singularity misc Hexagonal superlattice misc Negative thermal misc Expansion misc Chemistry Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices
authorStr	Filippo S. Boi
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topic_title	QD1-999 Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices HOPG Graphite van Hove singularity Hexagonal superlattice Negative thermal Expansion
topic	misc QD1-999 misc HOPG misc Graphite misc van Hove singularity misc Hexagonal superlattice misc Negative thermal misc Expansion misc Chemistry
topic_unstemmed	misc QD1-999 misc HOPG misc Graphite misc van Hove singularity misc Hexagonal superlattice misc Negative thermal misc Expansion misc Chemistry
topic_browse	misc QD1-999 misc HOPG misc Graphite misc van Hove singularity misc Hexagonal superlattice misc Negative thermal misc Expansion misc Chemistry
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title	Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices
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title_full	Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices
author_sort	Filippo S. Boi
journal	Carbon Trends
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author_browse	Filippo S. Boi Ayoub Taallah Shuai Gao Jian Guo Shanling Wang Anna Corrias
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author-letter	Filippo S. Boi
doi_str_mv	10.1016/j.cartre.2021.100034
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title_sort	scanning tunneling microscopy identification of van hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices
callnumber	QD1-999
title_auth	Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices
abstract	We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices.
abstractGer	We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices.
abstract_unstemmed	We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices.
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title_short	Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices
url	https://doi.org/10.1016/j.cartre.2021.100034 https://doaj.org/article/3b906650efc8463589428bb3e8677477 http://www.sciencedirect.com/science/article/pii/S2667056921000110 https://doaj.org/toc/2667-0569
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Boi</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2021</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">We report a novel investigation on the structural, electronic and magnetic properties of highly-oriented-pyrolytic-graphite (HOPG) by employing STM/S, TEM and SQUID. Van Hove singularities (vHs) were identified by STS-acquisition of local-density-of-states spectra (LDOS) acquired from moiré-superlattice-periodicities D ~0.5 nm (θ rot ~28.6°), ~2 nm (θ rot of ~7.08°) and ~ 4 nm (θ rot ~3.6°). A possible interlayer-coupling- or moiré-thickness-induced variation of the vHs-separation-parameter was identified. Investigation of the spatial-distribution of the moiré-superlattices by exfoliation revealed also D ~13.87 nm (θ rot ~1.02°), ~13.0 nm (θ rot ~1.09°), ~12.65 nm (θ rot ~1.12°) and ~2.03 nm (θ rot ~7.0°). These observations were further supported by additional LDOS spectra acquired on HOPG from moiré-superlattice-periodicities D ~8 nm (θ rot ~1.8°). In the latter, the unusual presence of four vHs peaks evidenced the existence of multiple rotational effects between internal sublattices. Extended analyses were further performed by T-XRD from 12 K to 298 K. Unknown peak-features exhibiting unusual T-dependent shifts were analysed at 2θ ~ 21° (Fig. 6A-C) and ~ 43° (Fig. 6D). ZFC and FC-signals from the exfoliated lamellae further evidenced an anisotropic ferromagnetic behaviour, possibly involving the coexistence of (1) disorder induced percolative ferromagnetism and (2) additional magnetic components arising from the locally twisted sublattices, which were found to exhibit the moiré superlattices.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">HOPG</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Graphite</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">van Hove singularity</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Hexagonal superlattice</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Negative thermal</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Expansion</subfield></datafield><datafield tag="653" ind1=" " ind2="0"><subfield 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Scanning tunneling microscopy identification of van Hove singularities and negative thermal expansion in highly oriented pyrolytic graphite with hexagonal moiré superlattices

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