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ヤマガミ ヒロシ
YAMAGAMI HIROSHI
山上 浩志 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2007/09 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Itinerant to localized transition of f electrons in the antiferromagnetic superconductor UPd2Al3 |
| 執筆形態 | その他 |
| 掲載誌名 | NATURE PHYSICS |
| 出版社・発行元 | NATURE PUBLISHING GROUP |
| 巻・号・頁 | 3(9),pp.618-622 |
| 著者・共著者 | Shin-Ichi Fujimori,Yuji Saitoh,Tetsuo Okane,Atsushi Fujimori,Hiroshi Yamagami,Yoshinori Haga,Etsuji Yamamoto,Yoshichika Onuki |
| 概要 | In heavy-fermion compounds, f electrons show both itinerant and localized behaviour depending on the temperature(1). Above a characteristic temperature, T*, their magnetic properties can be described by completely 'localized' f-electron models. On the other hand, well below T*, their Fermi surfaces can be explained by the 'itinerant' f-electron model(2). These two models assume totally different natures of the f electrons, and how they transform between these states as a function of temperature has never been understood at the level of their electronic structures. Here, we use angle-resolved photoelectron spectroscopy to study the band structure of the heavy-fermion antiferromagnetic superconductor UPd2Al3 below and above T*, and find that the f bands, which form the Fermi surfaces at low temperatures, are excluded from the Fermi surfaces at high temperatures. This result demonstrates how the same f electrons can be both itinerant and localized. |
| DOI | 10.1038/nphys651 |
| ISSN | 1745-2473 |