Influence of substrates on epitaxial thin films of high-temperature superconductors

H. Sato*, M. Naito, A. Tsukada, S. Karimoto, A. Matsuda

*この研究の対応する著者

研究成果: Article査読

13 被引用数 (Scopus)

抄録

For growth of high-quality epitaxial thin films of high-temperature superconductors (HTSCs), it is essential to choose appropriate substrates. For a thin film of La2-xMxCuO4 (M=Ba, Sr), the superconducting transition temperature (Tc) is modified by the strain due to the lattice mismatch between the film and the substrate. For the compressively strained (001) films of La2-xSrxCuO4 and La2-xBaxCuO4 on LaSrAlO4 substrates, Tc reached 44 and 47 K, respectively, which are higher than the values for bulk samples. Moreover, the Tc-x phase diagrams for the compressed films did not show a local minimum at x∼0.125, the so-called "1/8 anomal". Based on the experimental results, we suggest that the reduction of antiferromagnetic spin fluctuation increases Tc in HTSCs. For thin films of Bi2Sr2CaCu2O8, we foun d that substrates with a small lattice mismatch are very effective in attaining a smooth and almost precipitate-free surface.

本文言語English
ページ(範囲)186-194
ページ数9
ジャーナルPhysica C: Superconductivity and its applications
362
1-4
DOI
出版ステータスPublished - 2001 9月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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