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タイトル: | Ligand-hole localization in oxides with unusual valence Fe. |
著者: | Chen, Wei-Tin Saito, Takashi Hayashi, Naoaki Takano, Mikio Shimakawa, Yuichi https://orcid.org/0000-0003-1019-2512 (unconfirmed) |
著者名の別形: | 島川, 祐一 |
キーワード: | Materials chemistry Materials physics Electronic materials and devices Magnetic materials and devices |
発行日: | Jun-2012 |
出版者: | Nature Publishing Group |
誌名: | Scientific reports |
巻: | 2 |
論文番号: | 449 |
抄録: | Unusual high-valence states of iron are stabilized in a few oxides. A-site-ordered perovskite-structure oxides contain such iron cations and exhibit distinct electronic behaviors at low temperatures, e.g. charge disproportionation (4Fe(4+) → 2Fe(3+) + 2Fe(5+)) in CaCu(3)Fe(4)O(12) and intersite charge transfer (3Cu(2+) + 4Fe(3.75+) → 3Cu(3+) + 4Fe(3+)) in LaCu(3)Fe(4)O(12). Here we report the synthesis of solid solutions of CaCu(3)Fe(4)O(12) and LaCu(3)Fe(4)O(12) and explain how the instabilities of their unusual valence states of iron are relieved. Although these behaviors look completely different from each other in simple ionic models, they can both be explained by the localization of ligand holes, which are produced by the strong hybridization of iron d and oxygen p orbitals in oxides. The localization behavior in the charge disproportionation of CaCu(3)Fe(4)O(12) is regarded as charge ordering of the ligand holes, and that in the intersite charge transfer of LaCu(3)Fe(4)O(12) is regarded as a Mott transition of the ligand holes. |
著作権等: | This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/ |
URI: | http://hdl.handle.net/2433/157234 |
DOI(出版社版): | 10.1038/srep00449 |
PubMed ID: | 22690318 |
出現コレクション: | 学術雑誌掲載論文等 |
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