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Title
Japanese: 
English:Photoemission and x-ray absorption studies of the isostructural to Fe-based superconductors diluted magnetic semiconductor Ba1−xKx(Zn1−yMn<sb>y)2As2 
Author
Japanese: 鈴木 博人, K Zhao, 芝田悟朗, 高橋文雄, 坂本祥哉, 吉松公平, Chen B. J., 組頭 広志, Chang F. -H., Lin H. -J., Huang D. –J., Chen C. -T., Bo Gu, S. Maekawa, Y.J Uemura, C. Q. Jin, 藤森 淳.  
English: H. Suzuki, K Zhao, G. Shibata, Y. Takahashi, S. Sakamoto, K. Yoshimatsu, B. J. Chen, H. Kumigashira, F. -H. Chang, H. -J. Lin, D. –J. Huang, C. -T. Chen, Bo Gu, S. Maekawa, Uemura Y.J, C. Q. Jin, A. Fujimori.  
Language English 
Journal/Book name
Japanese: 
English:Physical Review B 
Volume, Number, Page 91    14    140401
Published date Apr. 6, 2015 
Publisher
Japanese: 
English:American Physical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://link.aps.org/doi/10.1103/PhysRevB.91.140401
 
DOI https://doi.org/10.1103/PhysRevB.91.140401
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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