UV-Induced Change in the Electronic Structure of SrTiO

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概要

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• Both Ti L and K\beta resonant x-ray emission spectra (RXES) of SrTiO<inf>3</inf>were measured at low temperature, T\leq 40 K. Regardless of the d^{0}-ness of a Ti⁴⁺ion, a dd excitation peak in Ti L RXES is irreversibly created by UV irradiation, directly indicating a mixture of the d^{1}L electronic configuration under reduced symmetry around a Ti⁴⁺ion, where L denotes an oxygen hole. This mixture can also be evidenced by the UV-induced change in the relative intensity of two charge-transfer peaks observed in Ti K\beta RXES. A similar change is reported for a cubic-to-tetragonal ferroelectric phase transition in BaTiO<inf>3</inf>. We therefore conclude that the local ferroelectric moment, i.e., displacement of a Ti⁴⁺ion in an oxygen octahedron, is induced in SrTiO<inf>3</inf>by UV irradiation at low temperature.

• 2013-05-15

著者

• Nakatake Masashi

  Hiroshima Synchrotron Radiation Center Hiroshima University

• MARUYAMA Hiroshi

  Graduate School of Science, Hiroshima University

• Tezuka Yasuhisa

  Graduate School of Science and Engineering, Hirosaki University, Hirosaki, Aomori 036-8561, Japan

• Nakajima Nobuo

  Graduate School of Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan

• Nakajima Nobuo

  Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan

• Tezuka Yasuhisa

  Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8361, Japan

• Iwazumi Toshiaki

  Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan

• Kawakami Shuhei

  Graduate School of Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan

• Takigawa Takahiro

  Graduate School of Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan

• Maruyama Hiroshi

  Graduate School of Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan

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