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Jpn. J. Appl. Phys. 44 (2005) pp. L1491-L1493  |Previous Article| |Next Article|  |Table of Contents|
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Letter

Electronic Structure in Valence Band of Nd-Substituted Bi₄Ti₃O₁₂ Single Crystal Probed by Soft-X-Ray Emission Spectroscopy

Tohru Higuchi, Yuji Noguchi^1,2, Takashi Goto¹, Masaru Miyayama¹, Shik Shin^3,4, Kazuhiro Kaneda, Takeshi Hattori and Takeyo Tsukamoto

Department of Applied Physics, Tokyo University of Science, Tokyo 162-8601, Japan
¹Research Center for Advanced Science and Technology, University of Tokyo, Tokyo 153-8904, Japan
²PREST, Japan Science and Technology Agency (JST), Saitama 332-0012, Japan
³Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan
⁴RIKEN, Hyogo 679-5148, Japan

(Received August 25, 2005; accepted October 14, 2005; published November 25, 2005)

The electronic structure of Nd³⁺-substituted Bi₄Ti₃O₁₂ single crystals was studied by soft-X-ray emission spectroscopy. The valence band is in good accordance with the band calculation. The valence band is mainly composed of the O 2p state hybridized with Ti 3d and Bi 6s states. The hybridization effect between the Ti 3d and O 2p states increases with Nd³⁺ substitution, indicating a change in Ti–O bond length in the a–b plane. The hybridization effect between the Bi 6s and O 2p states decreases with Nd³⁺ substitution. The Bi–O hybridization effect is considered to be closely related to the ferroelectric behavior.

URL: http://jjap.jsap.jp/link?JJAP/44/L1491/
DOI: 10.1143/JJAP.44.L1491

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