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

Daiki Yamasaka, Kenta Tamagawa, Yoshimichi Ohki

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    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 languageEnglish
    Article number074103
    JournalJournal of Applied Physics
    Issue number7
    Publication statusPublished - 2011 Oct 1


    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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