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

Journal Article · Sat Oct 01 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3641974· OSTI ID:22038734

Yamasaka, Daiki; Tamagawa, Kenta; Ohki, Yoshimichi

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.

• OSTI ID: 22038734
• Journal Information: Journal of Applied Physics, Vol. 110, Issue 7; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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