Magnetic Structures and Spin States of NdBaCo2O5:5

Minoru Soda, Yukio Yasui, Masafumi Ito, Satoshi Iikubo, Masatoshi Sato, Kazuhisa Kakurai

研究成果: ジャーナルへの寄稿学術誌査読

23 被引用数 (Scopus)

抄録

Neutron diffraction studies have been carried out on a single crystal of oxygen-deficient perovskite NdBaCo2O5:5 in the temperature (T) range between 7K and 320 K. We have found a magnetic transition at Tc ~ 170 K, and a rapid change of the intensities of several reflections at Tc ~ 30 K. The magnetic structures have been analyzed at 7K (< Tc) and 40K (Tc < T < Tc). Non-collinear magnetic structures, which are based on the G-type antiferromagnetic structure, are proposed at these temperatures. In the T region between T* and Tc, Co3+ ions of CoO6 octahedra are in the intermediate spin state, and those of CoO5 pyramids are in the high spin state. In the region of T < Tc, the magnitude of the Co3 spins in the octahedra decreases gradually as T decreases, suggesting that the spin state approaches the low spin state. It is pointed out that the spin state of Co ions depends on the local structure around them.

本文言語英語
ページ(範囲)2857-2862
ページ数6
ジャーナルjournal of the physical society of japan
73
10
DOI
出版ステータス出版済み - 2004
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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