Magnetoelastic Coupling in the Perovskite-type Co Oxides Sr1−xYxCoO3−δ

Shuhei Imura, Shojiro Kimura, Satoshi Awaji, Masayuki Hagiwara, Ichiro Terasaki

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We performed thermal expansion and magnetostriction measurements of the perovskite-type Co oxides Sr1xYx-CoO3δ and Ca-doped Sr1yY0.22CayCoO3δ in high magnetic fields. Our experimental results show decrease of the magnetization of Sr1xYxCoO3−δ upon cooling in the magnetic ordered phase, accompanied by considerable shrinkage of the crystal lattice. On the contrary, the application of magnetic fields causes the expansion of the lattice volume, resulting in positive magnetstriction. The strong relation between the ferromagnetic moment and the crystal lattice, suggested by our measurements, is consistent with the occurrence of a spin crossover in the magnetic ordered phase of these compounds.

Original languageEnglish
Article number124706
JournalJournal of the Physical Society of Japan
Issue number12
Publication statusPublished - 2019


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