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JETP Letters

, Volume 107, Issue 3, pp 203–209 | Cite as

Spin State of Co3+ Ions in Layered GdBaCo2O5.5 Cobaltite in the Paramagnetic Phase

  • N. I. Solin
  • S. V. Naumov
  • S. V. Telegin
Condensed Matter

Abstract

A new scheme interpreting the changes in the spin state of Co3+ ions in GdBaCo2O5.5 in the course of the metal–insulator transition is proposed. The transition occurs gradually within a wide (~100 K) temperature range. The changes in the spin state of Co3+ ions are revealed using the data on the linear thermal expansion. In the metallic state, less than one-half of Co3+ ions are in the high-spin (HS, S = 2) state in octahedra, whereas the remaining ions are in the low-spin (LS, S = 0) state. The transition to the nonmetallic state occurs owing to the transformation of the HS state to the LS state in octahedra and to the transformation of some part of LS Со3+ in pyramids to the intermediate-spin (IS, S = 1) state.

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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  1. 1.Mikheev Institute of Metal Physics, Ural BranchRussian Academy of SciencesYekaterinburgRussia

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