Influence of Crystal Strain on Superconductivity of a-Axis Oriented YBa_2Cu_3O_x Films

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概要

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• Ion channeling measurements were executed to evaluate the crystal strain in a-axis oriented YBa_2Cu_3O_x (YBCO) films with different film thicknesses. The average Ba-Ba distance in the film plane as determined from the channeling angle of the Ba atomic row in the <110> (and <301>) direction was found to be close to the lattice constant of the SrTiO_3 substrate regardless of the film thickness. A similar result was also obtained for oxygen atoms. These results indicate that the films grow while matching their lattice constant to that of the substrate. The simultaneous strain relief induced by the increase in film thickness was suggested from the channeling yield in the obtained dip curve. Furthermore, the relaxed grain was confirmed near the surface of the 3500 Å film from the Ba <301> axial channeling. The influence of the crystal strain on the superconductivity of the a-axis oriented YBCO films is explained on the basis of variation in the site of apical oxygen.

• 社団法人応用物理学会の論文
• 1994-10-15

著者

• Ito W

  Seiko Epson Corp. Nagano Jpn

• KUMAGAI Masao

  Material Characterization Laboratory, Kanagawa High-Technology Foundation, Kanagawa Science Park

• MORISHITA Tadataka

  Superconductivity research Laboratory, International Superconductivity Technology Center

• Kumagai M

  Kanagawa Industrial Technology Research Institute

• Yabuta Konami

  Department Of Nuclear Engineering Graduate School Of Engineering Osaka University

• Kamai Masayoshi

  Joining And Welding Research Institute Osaka University

• Yoshida Y

  Photonics Research Institute National Institute Of Advanced Industrial Science And Technology (aist)

• Morishita Tadataka

  Superconductivity Research Laboratory International Superconductivity Technology Center

• ITO Wataru

  Superconductivity Research Laboratory, ISTEC

• MAHAJAN Sukesh

  Superconductivity Research Laboratory, ISTEC

• YOSHIDA Yukihisa

  Superconductivity Research Laboratory, ISTEC

• YABUTA Konami

  Material Characterization Laboratory, KTF

• Morishita T

  Superconductivity Research Laboratory International Superconductivity Technology Center

• Mahajan Sukesh

  Superconductivity Research Laboratory Istec

• Yoshida Yukihisa

  Superconductivity Research Laboratory Istec:(present Address)mitsubishi Electric Corp. Advanced Elec

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