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Title: Effects of ultraviolet photon irradiation on the transition metal impurities in LaAlO{sub 3}

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 LaAlO{sub 3} contains Cr and Fe as impurities. When LaAlO{sub 3} is exposed to photons with energies higher than 4.5 eV, the intensities of ESR signals due to Cr{sup 3+} and Fe{sup 3+} decrease, which indicates that electrons released by the photon irradiation are captured by Cr{sup 3+} and Fe{sup 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 La{sup 3+} (or Al{sup 3+}) vacancy, and the two weak ESR signals are assigned to the O{sup -} center and F{sup +} center.

Authors:
; ;
Publication Date:
OSTI Identifier:
22038734
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 110; Journal Issue: 7; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; ALUMINATES; ALUMINIUM IONS; CHROMIUM IONS; ELECTRON SPIN RESONANCE; EV RANGE; F CENTERS; FLUORINE IONS; IRON IONS; IRRADIATION; LANTHANUM COMPOUNDS; LANTHANUM IONS; MONOCRYSTALS; PARAMAGNETISM; ULTRAVIOLET RADIATION; ULTRAVIOLET SPECTRA; VISIBLE SPECTRA

Citation Formats

Yamasaka, Daiki, Tamagawa, Kenta, and Ohki, Yoshimichi. Effects of ultraviolet photon irradiation on the transition metal impurities in LaAlO{sub 3}. United States: N. p., 2011. Web. doi:10.1063/1.3641974.
Yamasaka, Daiki, Tamagawa, Kenta, & Ohki, Yoshimichi. Effects of ultraviolet photon irradiation on the transition metal impurities in LaAlO{sub 3}. United States. doi:10.1063/1.3641974.
Yamasaka, Daiki, Tamagawa, Kenta, and Ohki, Yoshimichi. Sat . "Effects of ultraviolet photon irradiation on the transition metal impurities in LaAlO{sub 3}". United States. doi:10.1063/1.3641974.
@article{osti_22038734,
title = {Effects of ultraviolet photon irradiation on the transition metal impurities in LaAlO{sub 3}},
author = {Yamasaka, Daiki and Tamagawa, Kenta and Ohki, Yoshimichi},
abstractNote = {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 LaAlO{sub 3} contains Cr and Fe as impurities. When LaAlO{sub 3} is exposed to photons with energies higher than 4.5 eV, the intensities of ESR signals due to Cr{sup 3+} and Fe{sup 3+} decrease, which indicates that electrons released by the photon irradiation are captured by Cr{sup 3+} and Fe{sup 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 La{sup 3+} (or Al{sup 3+}) vacancy, and the two weak ESR signals are assigned to the O{sup -} center and F{sup +} center.},
doi = {10.1063/1.3641974},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 7,
volume = 110,
place = {United States},
year = {2011},
month = {10}
}