Journal Article Photoemission and x-ray absorption studies of the isostructural to Fe-based superconductors diluted magnetic semiconductor Ba<sub>1−x</sub>K<sub>x</sub>(Zn<sub>1−y</sub>Mn<sb>y</sub>)<sub>2</sub>As<sub>2</sub>

鈴木, 博人  ,  Suzuki, Hakuto  ,  Zhao, K  ,  芝田, 悟朗  ,  Shibata, Goro  ,  高橋, 文雄  ,  Takahashi, Yukio  ,  坂本, 祥哉  ,  Sakamoto, Shoya  ,  吉松, 公平  ,  Yoshimatsu, Kohei  ,  Chen, B. J.  ,  Chen, B. J.  ,  組頭, 広志  ,  Kumigashira, Hiroshi  ,  Chang, F. -H.  ,  Chang, F. -H.  ,  Lin, H. -J.  ,  Lin, H. -J.  ,  Huang, D. –J.  ,  Huang, D. –J.  ,  Chen, C. -T.  ,  Chen, C. -T.  ,  Gu, Bo  ,  Maekawa, S.  ,  Y.J, Uemura  ,  Y.J, Uemura  ,  Jin, C. Q.  ,  藤森, 淳  ,  Fujimori, Atsushi

91 ( 14 )  , p.140401 , 2015-04 , American Physical Society
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 absorptionspectroscopy 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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