Synthesis of Superconducting Epitaxial Films of Ba_<1-x>K_xBiO_3 by Laser Ablation

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概要

• 論文の詳細を見る

• Superconducting epitaxial films of Ba_<1-x>K_xBiO_3 have been synthesized by laser ablation using a stoichiometric target (x=0.4). The films were deposited at substrate temperatures of 450-550℃ in argon at the pressure of 1 Torr with successive annealing at 350℃ in oxygen at pressure of 1 atm. The energy density of the laser was 1.5-2.5 J/cm^2 per pulse. The deposition temperature and the laser power affect the crystalline property, the superconducting property and the surface morphology. The film deposited at the substrate temperature of 510℃ has the highest onset T_c of 28 K. The films oriented with respect to<100>are found to be epitaxial, using a four-circle diffractometer. Cracking in the superconducting films is not found. The film on the MgO substrate with small lattice mismatch exhibits higher zero-resistance T_c than those on the other substrates, SrTiO_3 and LaSrGaO_4.

• 社団法人応用物理学会の論文
• 1993-10-15

著者

• FUJITA Jun-ichi

  Fundamental Res. Labs., NEC Corporation

• Ohshima Ken-ichi

  Institute Of Materials Science University Of Tsukuba

• UWE Hiromoto

  Institute of Applied Physics, University of Tsukuba

• Ohshima Ken-ichi

  Institute Of Applide Physics University Of Tsukuba

• Kim H‐t

  Seoul National Univ. Seoul Kor

• Kim Hyun-tak

  Institute Of Applied Physics University Of Tsukuba

• Uwe Hiromoto

  Institure Of Applied Physics University Of Tsukuba

• Fujita Jun-ichi

  Fundamental Research Laboratories Nec Corporation

• SUMI Atsushi

  Institute of Applied Physics, University of Tsukuba

• Sumi A

  Department Of Applied Physics School Of Engineering Nagoya University

• Ohshima K

  Univ. Tsukuba Tsukuba Jpn

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