期刊
NEW JOURNAL OF PHYSICS
卷 12, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/12/6/063029
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资金
- Global COE Program [B09]
- Grants-in-Aid for Scientific Research [19GS0207, 18350097, 17105002]
- MEXT of Japan
In this review article, we describe in detail the temperature-induced intermetallic charge transfer between A-site Cu and B-site Fe ions in the A-site-ordered double perovskites RCu3Fe4O12 (R = La, Bi). In these compounds, a very rare Cu3+ valence state at the square-planar-coordinated A sites was stabilized by high-pressure synthesis. By increasing the temperature, a Cu-Fe intermetallic charge transfer producing a high Fe3.75+ valence state occurred. This charge transfer gave rise to a first-order isostructural phase transition with unusual volume contraction, as well as to antiferromagnetism-to-paramagnetism and insulator-to-metal transitions. The substitution of Bi for La stabilized the low-temperature phase containing Cu3+ and increased the charge transfer transition temperature from 393K for LaCu3Fe4O12 to 428K for BiCu3Fe4O12.
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