Spin blockade, orbital occupation and charge ordering in La_(1.5)Sr_(0.5)CoO4

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dc.creatorChang, C. F.
dc.creatorHu, Z.
dc.creatorWu, Hua
dc.creatorBurnus, T.
dc.creatorHollmann, N.
dc.creatorBenomar, M.
dc.creatorLorenz, T.
dc.creatorTanaka, A.
dc.creatorLin, H. -J.
dc.creatorHsieh, H. H.
dc.creatorChen, C. T.
dc.creatorTjeng, L. H.
dc.date2009-01-23
dc.date.accessioned2026-07-07T12:52:16Z
dc.date.available2026-07-07T12:52:16Z
dc.descriptionUsing Co-L_(2,3) and O-K x-ray absorption spectroscopy, we reveal that the charge ordering in La_(1.5)Sr_(0.5)CoO4 involves high spin (S=3/2) Co^2+ and low spin (S=0) Co^3+ ions. This provides evidence for the spin blockade phenomenon as a source for the extremely insulating nature of the La_(2-x)Sr_(x)CoO4 series. The associated e_g^2 and e_g^0 orbital occupation accounts for the large contrast in the Co-O bond lengths, and in turn, the high charge ordering temperature. Yet, the low magnetic ordering temperature is naturally explained by the presence of the non-magnetic (S=0) Co^3+ ions. From the identification of the bands we infer that La_(1.5)Sr_(0.5)CoO4 is a narrow band material.
dc.description5 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0901.3642
dc.identifierhttp://arxiv.org/abs/0901.3642
dc.identifierPhysical Review Letters 102, 116401 (2009)
dc.identifierdoi:10.1103/PhysRevLett.102.116401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223244
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleSpin blockade, orbital occupation and charge ordering in La_(1.5)Sr_(0.5)CoO4
dc.typetext

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