Spin-Crossover Phenomena in Perovskite Cobaltites : Their History and Current Status(Interdisciplinary)
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- Asai Kichizo
- 電気通信大学大学院情報理工学研究科
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- Kobayashi Yoshihiko
- 東京医科大学物理学教室
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- Sato Keisuke
- 茨城工業高等専門学校
Bibliographic Information
- Other Title
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- ペロブスカイト型Co酸化物のスピンクロスオーバー現象 : その歴史と現状(交流)
- 交流 ペロブスカイト型Co酸化物のスピンクロスオーバー現象 : その歴史と現状
- コウリュウ ペロブスカイトガタ Co サンカブツ ノ スピンクロスオーバー ゲンショウ : ソノ レキシ ト ゲンジョウ
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Abstract
The perovskite cobaltites have been arousing widespread interest of researchers owing to the various spin states of Co^<3+>(3d)^6 ions and crossover among them. It has been known since 1966 that LaCoO_3 shows a spin crossover, or a spin-state transition, around 100K from the low spin (LS) nonmagnetic ground state with S=0 to a magnetic state. The relevant magnetic spin state of Co^<3+> still remains controversial. Although there have been many experimental results supporting the Jahn-Teller active intermediate spin (IS) state with S=1 as the magnetic state, there is instead a spectroscopic evidence for the high spin (HS) state with S=2. We argue a possibility that IS and HS states both excited in the 100K transition coexist above the transition temperature. The inhomogeneous spin phase may be caused by strong interactions among Co^<3+> ions in the magnetic spin states. We also review the magnetic and electronic anomaly around 500K which is commonly observed in RECoO_3 (RE = rare earth elements).
Journal
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- Butsuri
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Butsuri 70 (1), 6-13, 2015-01-05
The Physical Society of Japan
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Details 詳細情報について
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- CRID
- 1390001288158441600
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- NII Article ID
- 110009900502
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- NII Book ID
- AN00196952
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- ISSN
- 24238872
- 00290181
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- NDL BIB ID
- 026010628
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed