Effect of light Sr doping on the spin-state transition in LaCoO_3

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dc.creatorPodlesnyak, A.
dc.creatorConder, K.
dc.creatorPomjakushina, E.
dc.creatorMirmelstein, A.
dc.creatorAllenspach, P.
dc.creatorKhomskii, D. I.
dc.date2006-09-11
dc.date.accessioned2026-07-07T09:22:34Z
dc.date.available2026-07-07T09:22:34Z
dc.descriptionWe present an inelastic neutron scattering study of the low energy crystal-field excitations in the lightly doped cobalt perovskite La_0.998Sr_0.002CoO_3. In contrast to the parent compound LaCoO_3 an inelastic peak at energy transfer ~0.75 meV was found at temperatures below 30 K. This excitation apparently corresponds to a transition between a ground state orbital singlet and a higher excited orbital doublet, originating from a high-spin triplet split by a small trigonal crystal field. Another inelastic peak at an energy transfer ~0.6 meV was found at intermediate temperatures starting from T > 30 K. This confirms the presence of a thermally induced spin-state transition from the low-spin Co^3+ to a magnetic high-spin state in the non-disturbed LaCoO_3 matrix. We suggest that hole doping of LaCoO_3 leads to the creation of a magnetic polaron and hence to the low-to-high spin state transition on the relevant Co sites.
dc.description4 pages, 2 figures; based on a talk given at ICM'06, Kyoto; to appear in JMMM
dc.identifierhttps://arxiv.org/abs/cond-mat/0609247
dc.identifierhttp://arxiv.org/abs/cond-mat/0609247
dc.identifierJ. Magn. Magn. Mater., 310 (2007) 1552
dc.identifierdoi:10.1016/j.jmmm.2006.10.901
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/155420
dc.subjectStrongly Correlated Electrons
dc.titleEffect of light Sr doping on the spin-state transition in LaCoO_3
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