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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 | 2008/05 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Direct observation of dispersive Kondo resonance peaks in a heavy-fermion system |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW LETTERS |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 100(17) |
| 著者・共著者 | H. J. Im,T. Ito,H. -D. Kim,S. Kimura,K. E. Lee,J. B. Hong,Y. S. Kwon,A. Yasui,H. Yamagami |
| 概要 | Ce 4d-4f resonant angle-resolved photoemission spectroscopy was carried out to study the electronic structure of strongly correlated Ce 4f electrons in a quasi-two-dimensional nonmagnetic heavy-fermion system CeCoGe(1.2)Si(0.8). For the first time, dispersive coherent peaks of an f state crossing the Fermi level, the so-called Kondo resonance, are directly observed together with the hybridized conduction band. Moreover, the experimental band dispersion is quantitatively in good agreement with a simple hybridization-band picture based on the periodic Anderson model. The obtained physical quantities, i.e., coherent temperature, Kondo temperature, and mass enhancement, are comparable to the results of thermodynamic measurements. These results manifest an itinerant nature of Ce 4f electrons in heavy-fermion systems and clarify their microscopic hybridization mechanism. |
| DOI | 10.1103/PhysRevLett.100.176402 |
| ISSN | 0031-9007 |