Effects of ultraviolet photon irradiation on the transition metal impurities in LaAlO3

Daiki Yamasaka*, Kenta Tamagawa, Yoshimichi Ohki

*この研究の対応する著者

研究成果: Article査読

17 被引用数 (Scopus)

抄録

By measuring electron spin resonance (ESR) spectra at the X-band frequency and absorption spectra from the visible to ultraviolet region at room temperature, it was confirmed that perovskite single crystal LaAlO3 contains Cr and Fe as impurities. When LaAlO3 is exposed to photons with energies higher than 4.5 eV, the intensities of ESR signals due to Cr 3+ and Fe3+ decrease, which indicates that electrons released by the photon irradiation are captured by Cr3+ and Fe 3+. Concurrently with this, a broad optical absorption band at about 3.0 eV and two new broad and weak ESR signals appear. The former is attributable to a combination of a hole and a La3+ (or Al3+) vacancy, and the two weak ESR signals are assigned to the O- center and F + center.

本文言語English
論文番号074103
ジャーナルJournal of Applied Physics
110
7
DOI
出版ステータスPublished - 2011 10月 1

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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