Anisotropic Optical Spectra of YAlO3(YAP) Single Crystals in the Vacuum Ultraviolet Region

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  • Tomiki Tetsuhiko
    Department of Physics, Faculty of Science, University of the Ryukyus
  • Kaminao Minoru
    Department of Physics, Faculty of Science, University of the Ryukyus
  • Tanahara Yoshikazu
    Department of Physics, Faculty of Science, University of the Ryukyus
  • Futemma Tomoyoshi
    Department of Physics, Faculty of Science, University of the Ryukyus
  • Fujisawa Masami
    Synchrotron Radiation Laboratory, The Institute for Solid State Physics, University of Tokyo
  • Fukudome Fujito
    Department of Physics, Faculty of Science, University of the Ryukyus

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タイトル別名
  • Anisotropic Optical Spectra of YAlO<SUB>3</SUB> (YAP) Single Crystals in the Vacuum Ultraviolet Region
  • Anisotropic Optical Spectra of YAlO3 YA

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Optical spectra of YAlO3 (YAP) single crystals are measured for ⟨a⟩, ⟨b⟩ and ⟨c⟩⁄⁄E in the region from 6.5 eV to 42 eV by use of a plane polarized synchrotron radiation, E being the electric field of light. Anisotropic spectral behaviour of the intrinsic absorption including the tail absorption is found, and a tentative interpretation of spectral features is given in terms of the energy levels of the constituent atoms of YAP. It is found that the principal factor determining the interband absorption onset position is the bond length of Y3+–O2− in the compounds of Y2O3, YAP and YAG. The steepness constants σs0 of these compounds are found to decrease in magnitude with increasing deviation from the mean value of the Y3+–O2− bond lengths participated in the tail absorptions.

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