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Local electronic structure of Cr in the II-VI diluted ferromagnetic semiconductor Zn$$_{1-x}$$Cr$$_x$$Te

強磁性希薄磁性半導体Zn$$_{1-x}$$Cr$$_x$$Teの軟X線磁気円二色性による研究

小林 正起*; 石田 行章*; Hwang, J. I.*; Song, G. S.*; 藤森 淳; Yang, C. S.*; Lee, L.*; Lin, H.-J.*; Huang, D.-J.*; Chen, C. T.*; 竹田 幸治; 寺井 恒太*; 藤森 伸一; 岡根 哲夫; 斎藤 祐児; 山上 浩志; 小林 啓介*; 田中 新*; 齋藤 秀和*; 安藤 功兒*

Kobayashi, Masaki*; Ishida, Yukiaki*; Hwang, J. I.*; Song, G. S.*; Fujimori, Atsushi; Yang, C. S.*; Lee, L.*; Lin, H.-J.*; Huang, D.-J.*; Chen, C. T.*; Takeda, Yukiharu; Terai, Kota*; Fujimori, Shinichi; Okane, Tetsuo; Saito, Yuji; Yamagami, Hiroshi; Kobayashi, Keisuke*; Tanaka, Arata*; Saito, Hidekazu*; Ando, Koji*

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). The line shape of the Cr $$2p$$ XMCD spectra is independent of $$H$$, $$T$$, and $$x$$, indicating that the ferromagnetism is originated from the same electronic states of the Cr ion. Cluster-model analysis indicates that the ferromagnetic XMCD signal is originated from Cr ions substituted for the Zn site. The Cr $$3d$$ partial density of states extracted using Cr $$2p to 3d$$ resonant PES shows a broad feature near the top of the valence band, suggesting strong $$s$$,$$p$$-$$d$$ hybridization. Based on these findings, we conclude that double exchange mechanism cannot explain the ferromagnetism in Zn$$_{1-x}$$Cr$$_{x}$$Te.

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パーセンタイル:37.82

分野:Physics, Multidisciplinary

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