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Frustrated magnetism in the two-dimensional triangular lattice of LixCoO2

hal.structure.identifierCentral Research and Development Laboratory
dc.contributor.authorSUGIYAMA, J.
hal.structure.identifierCentral Research and Development Laboratory
dc.contributor.authorNOZAKI, H.
hal.structure.identifierCanadian Institute for Advanced Research [CIFAR]
hal.structure.identifierDepartment of Physics and Astronomy [Vancouver]
hal.structure.identifierTRIUMF [Vancouver]
dc.contributor.authorBREWER, J. H.
hal.structure.identifierTRIUMF [Vancouver]
dc.contributor.authorANSALDO, E. J.
hal.structure.identifierTRIUMF [Vancouver]
dc.contributor.authorMORRIS, G. D.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDELMAS, Claude
dc.date.issued2005
dc.identifier.issn1098-0121
dc.description.abstractEnMagnetism of the simplest layered cobaltite LixCoO2 with x=1.0, 0.95, and 0.7 has been investigated by positive muon spin rotation and relaxation (µ+SR) spectroscopy together with magnetic susceptibility measurements, using polycrystalline samples in the temperature range between 300 and 1.8 K. Weak transverse field µ+SR showed the appearance of magnetism below ~65 K (=Tcun) for the sample with x=1.0. The volume fraction of the magnetic phase at 1.8 K is determined to be ~20% for LiCoO2, strongly suggesting that the observed magnetism is not induced by impurities but is an intrinsic behavior. This indicates that either a charge disproportionation (2Co3+->Co2++Co4+), a spin state transition (t6/2g->t5/2ge1g), or an appearance of magnetic Co3+ at surface occurs below 65 K. Zero field µ+SR spectra of LiCoO2 consist mainly of a slow relaxing signal due to random fields even at 1.8 K plus a small amount of a fast relaxing signal and an oscillating component, implying the presence of an antiferromagnetic order, as in the case of NaxCoO2 with x0.75. For Li-deficient LixCoO2 samples, T decreases with decreasing x from 50 K for x=0.95 to 25 K for x=0.7. The volume fraction of the magnetic phase is however almost independent of x and is estimated as 20% at 1.8 K, but no oscillations were observed in the zero field spectrum.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.subject.enMagnetic phase boundaries
dc.subject.enMuon spin rotation
dc.subject.enRelaxation
dc.subject.enSpin-density waves
dc.subject.enThermoelectric and thermomagnetic effects
dc.title.enFrustrated magnetism in the two-dimensional triangular lattice of LixCoO2
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevB.72.144424
dc.subject.halChimie/Matériaux
bordeaux.journalPhysical Review B: Condensed Matter and Materials Physics (1998-2015)
bordeaux.pagep. 144424 (9 p.)
bordeaux.volumevol. 72, n° 14
bordeaux.peerReviewedoui
hal.identifierhal-00019116
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00019116v1
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