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Magnetic nature of KxCoO2 near the antiferromagnetic phase with x=0.5: Positive muon spin rotation and relaxation

dc.contributor.authorSUGIYAMA, Jun
dc.contributor.authorIKEDO, Yutaka
hal.structure.identifierTRIUMF [Vancouver]
dc.contributor.authorRUSSO, Peter L.
dc.contributor.authorNOZAKI, Hiroshi
dc.contributor.authorMUKAI, Kazuhiko
hal.structure.identifierLaboratory for Muon-Spin Spectroscopy [LMU]
dc.contributor.authorANDREICA, Daniel
hal.structure.identifierLaboratory for Muon-Spin Spectroscopy [LMU]
dc.contributor.authorAMATO, Alex
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBLANGERO, Maxime
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDELMAS, Claude
dc.date.issued2007
dc.identifier.issn1098-0121
dc.description.abstractEnIn order to elucidate the magnetic nature of KxCoO2 in the vicinity of x=0.5, we have measured positive muon spin rotation and relaxation (µ+SR) spectra using polycrystalline samples of x=0.6, 4/7, and 0.5 in the temperature range between 1.8 and 300 K. A zero-field spectrum suggests the existence of localized but disordered moments below 20 K for the x=0.6 sample, whereas the spectra reveal the absence of magnetic moments in the x=4/7 sample. Combining our µ+SR results with the results of resistivity and susceptibility measurements, it is found that the phase boundary between the Curie-Weiss metal and Pauli-paramagnetic metal exists between x=0.6 and 4/7. For the rhombohedral x= 0.5 sample (i.e., β phase), the quasistatic antiferromagnetic (AF) order appears below 58 K (=TN), and the whole sample enters into the AF phase below TN, as in the case for the hexagonal γ-K0.5CoO2. This suggests that the interplane interaction is most unlikely to be crucial for determining the magnetic nature of the CoO2 plane. The complex T dependence of the internal AF fields, particularly the drastic change at the charge-order transition temperature (TCO= 20 K), is qualitatively explained by the change in the muon sites induced by charge order in the CoO2 planes
dc.language.isoen
dc.publisherAmerican Physical Society
dc.subject.enMagnetic phase boundaries
dc.subject.enAntiferromagnetics
dc.subject.enMuon spin rotation and relaxation
dc.subject.enSpin arrangements in magnetically ordered materials
dc.title.enMagnetic nature of KxCoO2 near the antiferromagnetic phase with x=0.5: Positive muon spin rotation and relaxation
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevB.76.104412
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
bordeaux.journalPhysical Review B: Condensed Matter and Materials Physics (1998-2015)
bordeaux.page104412
bordeaux.volume76
bordeaux.issue10
bordeaux.peerReviewedoui
hal.identifierhal-00171536
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00171536v1
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