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Article: Charge ordering and phase separation in the infinite dimensional extended Hubbard model

TitleCharge ordering and phase separation in the infinite dimensional extended Hubbard model
Authors
KeywordsPhysics
Issue Date2004
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 2004, v. 70 n. 8, p. 085118-1-085118-8 How to Cite?
AbstractWe study the extended Hubbard model with both on-site (U) and nearest neighbor (V) Coulomb repulsion using the exact diagonalization method within the dynamical mean field theory. For a fixed U (U=2.0), the T-n phase diagrams are obtained for V=1.4 and V=1.2, at which the ground state of n=1/2 system is charge-ordered and charge-disordered, respectively. In both cases, robust charge order is found at finite temperature and in an extended filling regime around n=1/2. The order parameter changes nonmonotonously with temperature. For V=1.4, phase separation between charge-ordered and charge-disordered phases is observed in the low temperature and n<0.5 regime. It is described by an "S"-shaped structure of the n-μ curve. For V =1.2, the ground state is charge-disordered, and a reentrant charge-ordering transition is observed for 0.42
Persistent Identifierhttp://hdl.handle.net/10722/43460
ISSN
2001 Impact Factor: 3.07
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTong, NHen_HK
dc.contributor.authorShen, SQen_HK
dc.contributor.authorBulla, Ren_HK
dc.date.accessioned2007-03-23T04:46:07Z-
dc.date.available2007-03-23T04:46:07Z-
dc.date.issued2004en_HK
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2004, v. 70 n. 8, p. 085118-1-085118-8en_HK
dc.identifier.issn0163-1829en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43460-
dc.description.abstractWe study the extended Hubbard model with both on-site (U) and nearest neighbor (V) Coulomb repulsion using the exact diagonalization method within the dynamical mean field theory. For a fixed U (U=2.0), the T-n phase diagrams are obtained for V=1.4 and V=1.2, at which the ground state of n=1/2 system is charge-ordered and charge-disordered, respectively. In both cases, robust charge order is found at finite temperature and in an extended filling regime around n=1/2. The order parameter changes nonmonotonously with temperature. For V=1.4, phase separation between charge-ordered and charge-disordered phases is observed in the low temperature and n<0.5 regime. It is described by an "S"-shaped structure of the n-μ curve. For V =1.2, the ground state is charge-disordered, and a reentrant charge-ordering transition is observed for 0.42<n<0.68. The relevance of our results to experiments for doped manganites is discussed.en_HK
dc.format.extent120678 bytes-
dc.format.extent34304 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physicsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.en_HK
dc.subjectPhysicsen_HK
dc.titleCharge ordering and phase separation in the infinite dimensional extended Hubbard modelen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=70&issue=8&spage=085118:1&epage=8&date=2004&atitle=Charge+ordering+and+phase+separation+in+the+infinite+dimensional+extended+Hubbard+modelen_HK
dc.identifier.emailShen, SQ: sshen@hkucc.hku.hken_HK
dc.identifier.authorityShen, SQ=rp00775en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.70.085118en_HK
dc.identifier.scopuseid_2-s2.0-19544388926en_HK
dc.identifier.hkuros97398-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-19544388926&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume70en_HK
dc.identifier.issue8en_HK
dc.identifier.spage085118en_HK
dc.identifier.epage1en_HK
dc.identifier.isiWOS:000223716700040-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridTong, NH=7003973832en_HK
dc.identifier.scopusauthoridShen, SQ=7403431266en_HK
dc.identifier.scopusauthoridBulla, R=7003849678en_HK
dc.identifier.citeulike3181332-

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