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

^*Corresponding author for this work

Kagami Memorial Research Institute for Materials Science and Technology

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

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.

Original language	English
Article number	074103
Journal	Journal of Applied Physics
Volume	110
Issue number	7
DOIs	https://doi.org/10.1063/1.3641974
Publication status	Published - 2011 Oct 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Effects of ultraviolet photon irradiation on the transition metal impurities in LaAlO3",

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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T1 - Effects of ultraviolet photon irradiation on the transition metal impurities in LaAlO3

AU - Yamasaka, Daiki

AU - Tamagawa, Kenta

AU - Ohki, Yoshimichi

PY - 2011/10/1

Y1 - 2011/10/1

N2 - 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.

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

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