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Title
Japanese: 
English:Thickness-dependent ferromagnetic metal to paramagnetic insulator transition in La0.6Sr0.4MnO3 thin films studied by x-ray magnetic circular dichroism 
Author
Japanese: 芝田 悟朗, 吉松 公平, 坂井 延寿, V. R. Singh, Verma V. K., 石上啓介, 原野貴幸, 門野利治, 竹田幸治, 岡根哲夫, 斎藤祐児, 山上浩志, 澤彰仁, 組頭 広志, 尾嶋 正治, 小出常晴, 藤森 淳.  
English: G. Shibata, K. Yoshimatsu, Enju Sakai, V. R. Singh, V. K. Verma, Keisuke Ishigami, Takayuki Harano, Toshiharu Kadono, Yukiharu Takeda, Tetsuo Okane, Yuji Saitoh, Hiroshi Yamagami, Akihito Sawa, Hiroshi Kumigashira, Masaharu Oshima, Tsuneharu Koide, Atsushi Fujimori.  
Language English 
Journal/Book name
Japanese: 
English:Physical Review B 
Volume, Number, Page 89        235123
Published date June 23, 2014 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
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DOI https://doi.org/10.1103/PhysRevB.89.235123
Abstract 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 theMn valence abruptly decreased towardsMn3+. 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.

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