Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3

F. Guillou; Y. Bréard; V. Hardy

doi:10.1016/j.solidstatesciences.2013.07.013

Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3

Strongly Correlated Electrons 2015-06-16 v1

Authors: F. Guillou , Y. Bréard , V. Hardy

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Abstract

(Pr0.7Sm0.3)0.7Ca0.3CoO3 belongs to a class of cobalt oxides undergoing a first-order transition (T* close to 90 K) associated to a coupled change in the valence and spin-state degrees of freedom. The Curie-Weiss regime present around room temperature (T >> T*) was analysed in detail to address the controversial issue of the cobalt spin states above the transition. This magnetic investigation indicates that the Co4+ are in an intermediate spin-state, while the Co3+ are in a mixed state combining low-spin and high-spin states. These results are discussed with respect to the literature on related compounds and recent results of x-ray absorption spectroscopy.

Keywords

cobalt oxides spin-state transition valence transition intermediate spin-state Curie-Weiss regime x-ray absorption spectroscopy

Cite

@article{arxiv.1307.3966,
  title  = {Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3},
  author = {F. Guillou and Y. Bréard and V. Hardy},
  journal= {arXiv preprint arXiv:1307.3966},
  year   = {2015}
}

Comments

12 pages, 4 figures Accepted in Solid State Science

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