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Article: Atomic spin, molecular orbitals, and anomalous antiferromagnetism in insulating V2O3

TitleAtomic spin, molecular orbitals, and anomalous antiferromagnetism in insulating V2O3
Authors
Issue Date2001
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 2001, v. 63 n. 14, p. 1444221-14442216 How to Cite?
AbstractA theory of the orbital ordering and the anomalous antiferromagnetism in V2O3 is developed on the basis of a realistic description of the V3+ atomic states. The effective electronic degrees of freedom in the insulating phase are found to be successively reduced to a set of molecular orbitals of V pairs along the trigonal axis. We derive the molecular interactions for the lowest orbital doublet and analyze their possible ordered phases in analogy with the Kugel-Khomskii model for the cubic perovskites. It is shown that the complex spin structure of V2O3 is stabilized uniquely in a reasonable parameter region, and that it is associated with an unusual ferro-type orbital order involving the intramolecular correlation of V atomic orbitals. This characteristic orbital state is shown to be consistent with the monoclinic lattice distortion, the anisotropy of spin exchange couplings, and the spin orientation in the antiferromagnetic phase of V2O3. Based on those analyses, improved molecular orbital states are proposed and recent experiments on neutron and x-ray scattering are discussed.
Persistent Identifierhttp://hdl.handle.net/10722/174803
ISSN
2001 Impact Factor: 3.07
References

 

DC FieldValueLanguage
dc.contributor.authorShiina, Ren_US
dc.contributor.authorMila, Fen_US
dc.contributor.authorZhang, FCen_US
dc.contributor.authorRice, TMen_US
dc.date.accessioned2012-11-26T08:47:32Z-
dc.date.available2012-11-26T08:47:32Z-
dc.date.issued2001en_US
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2001, v. 63 n. 14, p. 1444221-14442216en_US
dc.identifier.issn0163-1829en_US
dc.identifier.urihttp://hdl.handle.net/10722/174803-
dc.description.abstractA theory of the orbital ordering and the anomalous antiferromagnetism in V2O3 is developed on the basis of a realistic description of the V3+ atomic states. The effective electronic degrees of freedom in the insulating phase are found to be successively reduced to a set of molecular orbitals of V pairs along the trigonal axis. We derive the molecular interactions for the lowest orbital doublet and analyze their possible ordered phases in analogy with the Kugel-Khomskii model for the cubic perovskites. It is shown that the complex spin structure of V2O3 is stabilized uniquely in a reasonable parameter region, and that it is associated with an unusual ferro-type orbital order involving the intramolecular correlation of V atomic orbitals. This characteristic orbital state is shown to be consistent with the monoclinic lattice distortion, the anisotropy of spin exchange couplings, and the spin orientation in the antiferromagnetic phase of V2O3. Based on those analyses, improved molecular orbital states are proposed and recent experiments on neutron and x-ray scattering are discussed.en_US
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_US
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physicsen_US
dc.titleAtomic spin, molecular orbitals, and anomalous antiferromagnetism in insulating V2O3en_US
dc.typeArticleen_US
dc.identifier.emailZhang, FC: fuchun@hkucc.hku.hken_US
dc.identifier.authorityZhang, FC=rp00840en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0034900360en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034900360&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume63en_US
dc.identifier.issue14en_US
dc.identifier.spage1444221en_US
dc.identifier.epage14442216en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridShiina, R=7003392304en_US
dc.identifier.scopusauthoridMila, F=7006122264en_US
dc.identifier.scopusauthoridZhang, FC=14012468800en_US
dc.identifier.scopusauthoridRice, TM=7201893707en_US

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