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Local structure of LiNiO2 studied by neutron diffraction

hal.structure.identifierUniversity of Pennsylvania
dc.contributor.authorCHUNG, J.-H.
hal.structure.identifierLos Alamos National Laboratory [LANL]
dc.contributor.authorPROFFEN, Th.
hal.structure.identifierJapan Atomic Energy Agency
dc.contributor.authorSHAMOTO, S.
hal.structure.identifierLaboratoire matériaux et microélectronique de Provence [L2MP]
dc.contributor.authorGHORAYEB, A. M.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCROGUENNEC, Laurence
hal.structure.identifierDepartment of Physics and Astronomy [Knoxville]
dc.contributor.authorTIAN, W.
hal.structure.identifierDepartment of Physics and Astronomy [Knoxville]
hal.structure.identifierOak Ridge National Laboratory [Oak Ridge] [ORNL]
dc.contributor.authorSALES, B. C.
hal.structure.identifierDepartment of Physics and Astronomy [Knoxville]
dc.contributor.authorJIN, R.
hal.structure.identifierDepartment of Physics and Astronomy [Knoxville]
dc.contributor.authorMANDRUS, D.
hal.structure.identifierDepartment of Materials Science and Engineering [Knoxville]
hal.structure.identifierDepartment of Physics and Astronomy [Knoxville]
hal.structure.identifierOak Ridge National Laboratory [Oak Ridge] [ORNL]
dc.contributor.authorEGAMI, T.
dc.date.issued2005
dc.identifier.issn1098-0121
dc.description.abstractEnThe nature of the magnetic state of LiNiO2 has been controversial. In this compound Ni spins (S = 1/2) form a triangular lattice with the possibility of magnetic frustration, but the exact state of spin correlation has not yet been known in spite of the extensive research work. A factor that complicates understanding of the magnetic state is the orbital state of Ni3+ which is a Jahn-Teller (JT) ion. While there is no signature of long-range Jahn-Teller distortion, local JT distortion has been suspected. We have performed neutron diffraction and atomic pair-density function analyses up to unprecedented large distances to discover a number of unusual features, such as anomalous peak broadening, local JT distortion, sharp oxygen-oxygen distance correlations, and inverted temperature dependence of medium range correlation. These observations are best explained by local orbital ordering of Ni3+ ions into three sublattices. This orbital ordering, however, cannot develop into long-range order because of the strain field it generates, and domains of about 10 nm in size are formed. Domains are susceptible to random pinning by impurities (site disorder) resulting in the loss of structural long-range order. We suggest that this local orbital ordering is the basis for the complex magnetic properties observed in this compound.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.subject.enZeeman and Stark splitting
dc.subject.enJahn-Teller effect
dc.subject.enNeutron diffraction
dc.subject.enStrongly correlated electron systems
dc.subject.enHeavy fermions
dc.subject.enSpin-orbit coupling
dc.title.enLocal structure of LiNiO2 studied by neutron diffraction
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevB.71.064410
dc.subject.halChimie/Matériaux
bordeaux.journalPhysical Review B: Condensed Matter and Materials Physics (1998-2015)
bordeaux.page064410 (11 p.)
bordeaux.volume71
bordeaux.issue6
bordeaux.peerReviewedoui
hal.identifierhal-00022199
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00022199v1
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