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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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| 発行・発表の年月 | 2014/06/23 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Thickness-dependent ferromagnetic metal to paramagnetic insulator transition in La0.6 Sr0.4 MnO3 thin films studied by x-ray magnetic circular dichroism |
| 執筆形態 | その他 |
| 掲載誌名 | Physical Review B - Condensed Matter and Materials Physics |
| 巻・号・頁 | 89(23) |
| 著者・共著者 | G. Shibata,K. Yoshimatsu,E. Sakai,V. R. Singh,V. K. Verma,K. Ishigami,T. Harano,T. Kadono,Y. Takeda,T. Okane,Y. Saitoh,H. Yamagami,A. Sawa,H. Kumigashira,M. Oshima,T. Koide,A. Fujimori |
| 概要 | Metallic transition-metal oxides undergo a metal-to-insulator transition (MIT) as the film thickness decreases across a critical thickness of several monolayers (MLs), but its driving mechanism remains controversial. We have studied the thickness-dependent MIT of the ferromagnetic metal La0.6Sr0.4MnO3 by x-ray absorption spectroscopy and x-ray magnetic circular dichroism. As the film thickness was decreased across the critical thickness of the MIT (6-8 ML), a gradual decrease of the ferromagnetic signals and a concomitant increase of paramagnetic signals were observed, while the Mn valence abruptly decreased towards Mn3+. These observations suggest that the ferromagnetic phase gradually and most likely inhomogeneously turns into the paramagnetic phase and both phases abruptly become insulating at the critical thickness. © 2014 American Physical Society. |
| DOI | 10.1103/PhysRevB.89.235123 |
| ISSN | 1098-0121/1550-235X |