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

Daiki Yamasaka; Kenta Tamagawa; Yoshimichi Ohki

doi:10.1063/1.3641974

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

各務記念材料技術研究所

研究成果: Article › 査読

18 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
巻	110
号	7
DOI	https://doi.org/10.1063/1.3641974
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）

文献へのアクセス

10.1063/1.3641974

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引用スタイル

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abstract = "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.",

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AB - 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.

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