Pressure effects on the charge-ordering transition of BaYCo 2O5.0

Y. Moritomo*, M. Hanawa, Sheng Xu, H. Ishikawa, Y. Ohishi, K. Kato, T. Honma, P. Karen, M. Karppinen, H. Yamauchi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Pressure effects on the charge-ordering (CO) transition have been investigated for an oxygen-deficient double-perovskite cobalt oxide, BaYCo 2O5.0, through resistivity measurements using a piston-cylinder-type clamp cell. The charge-ordering temperature TCO rises (+ 19 K/GPa) as pressure increases, making a sharp contrast with the pressure suppression of TCO seen for the isostructural BaSmFe 2O5.0. We have further determined the atomic coordinates under elevated pressures, and ascribed this unexpected behavior of BaYCo 2O5.0 to the pressure enhancement of the orthorhombic distortion s (≡a - b).

Original languageEnglish
Article number134118
Pages (from-to)134118-1-134118-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number13
DOIs
Publication statusPublished - Apr 2004
MoE publication typeA1 Journal article-refereed

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