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Journal of Experimental and Theoretical Physics

, Volume 128, Issue 1, pp 98–104 | Cite as

Spin Crossover and Magnetic Properties of Ba-Substituted Cobaltites

  • I. O. TroyanchukEmail author
  • M. V. Bushinsky
  • V. V. Sikolenko
  • C. Ritter
ORDER, DISORDER, AND PHASE TRANSITION IN CONDENSED SYSTEM

Abstract

The dependence of the properties of the La0.45Ba0.55CoO3 – δ and La0.4Ba0.6CoO3 – δ cobaltites on the oxygen content has been studied. A decrease in the oxygen content leads to the stabilization of cobalt ions in the 3+ oxidation state and to a transition from a conducting state with positive exchange interaction to an antiferromagnetic insulating state with a long range magnetic order with decreasing temperature. Application of a magnetic field gradually transforms the antiferromagnetic state to the ferromagnetic one. The cubic lattice parameter is independent of temperature and an anomalous dependence of the magnetization, electrical conductivity, and magnetoresistance is treated within a spin crossover scenario. It is assumed that the high-temperature conducting phase and ferromagnetic clusters correspond to a collective intermediate spin state of cobalt ions, whereas the low-temperature antiferromagnetic phase corresponds to a mixed high-spin/low-spin state.

Notes

ACKNOWLEDGMENTS

This work was supported by the Belarussian Foundation for Basic Research (project no. F17D-007).

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Copyright information

© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  • I. O. Troyanchuk
    • 1
    Email author
  • M. V. Bushinsky
    • 1
  • V. V. Sikolenko
    • 2
  • C. Ritter
    • 3
  1. 1.Scientific-Practical Materials Research Centre, National Academy of Sciences of BelarusMinskBelarus
  2. 2.Joint Institute for Nuclear ResearchDubnaRussia
  3. 3.Institut Laue LangevinGrenobleFrance

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