Spin state and magnetic transformations in Sr0.7 Y0.3 CoO2.62 at high pressures

N. O. Golosova, D. P. Kozlenko, L. S. Dubrovinsky, O. A. Drozhzhin, S. Ya Istomin, B. N. Savenko

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24 Citations (Scopus)

Abstract

The crystal and magnetic structures of Sr0.7 Y0.3 CoO2.62 were studied at high pressures up to 30 and 5 GPa by means of x-ray and neutron diffraction, respectively. An evidence for the pressure-induced change in the spin state of Co3+ ions in octahedral coordination from intermediate spin to low spin was found from a behavior of Co-O bond lengths and obtained ordered magnetic moments values. The high spin state of the tetrahedral and five-coordinated Co3+ ions in oxygen deficient layers remains stable under pressure. A rapid suppression of the initial G -type antiferromagnetic (AFM) state and a formation of the new AFM state with a propagation vector (1/2 1/2 1) was found. The possible mechanisms of the pressure-induced magnetic transformation are discussed.

Original languageEnglish
Article number104431
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number10
DOIs
Publication statusPublished - 3 Mar 2009
Externally publishedYes

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