|
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 |
|
| 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 | Local electronic structure of Cr in the II-VI diluted ferromagnetic semiconductor Zn(1-x)Cr(x)Te |
| 執筆形態 | その他 |
| 掲載誌名 | NEW JOURNAL OF PHYSICS |
| 出版社・発行元 | IOP PUBLISHING LTD |
| 巻・号・頁 | 10 |
| 著者・共著者 | M. Kobayashi,Y. Ishida,J. I. Hwang,G. S. Song,A. Fujimori,C. S. Yang,L. Lee,H-J Lin,D. J. Huang,C. T. Chen,Y. Takeda,K. Terai,S-I Fujimori,T. Okane,Y. Saitoh,H. Yamagami,K. Kobayashi,A. Tanaka,H. Saito,K. Ando |
| 概要 | The electronic structure of the Cr ions in the diluted ferromagnetic semiconductor Zn(1-x)Cr(x)Te ( x = 0.03 and 0.15) thin films has been investigated using x-ray magnetic circular dichroism (XMCD) and photoemission spectroscopy (PES). Magnetic-field (H) and temperature (T) dependences of the Cr 2p XMCD spectra correspond well to the magnetization measured by a SQUID magnetometer. The line shape of the Cr 2p XMCD spectra is independent of H, T and x, indicating that the ferromagnetism originated from the same electronic states of the Cr ion. A cluster-model analysis indicates that although there are two or more kinds of Cr ions in the Zn(1-x)Cr(x)Te samples, the ferromagnetic XMCD signal originated from Cr ions substituted for the Zn site. The Cr 3d partial density of states extracted using Cr 2p -> 3d resonant PES shows a broad feature near the top of the valence band, suggesting strong s,p-d hybridization. No density of states is detected at the Fermi level, consistent with their insulating behavior. Based on these findings, we conclude that the double-exchange mechanism cannot explain the ferromagnetism in Zn(1-x)Cr(x)Te. |
| DOI | 10.1088/1367-2630/10/5/055011 |
| ISSN | 1367-2630 |