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

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

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)186-194
Number of pages9
JournalPhysica C: Superconductivity and its Applications
Volume362
Issue number1-4
DOIs
Publication statusPublished - 2001 Sep
Externally publishedYes

Fingerprint

High temperature superconductors
Epitaxial films
high temperature superconductors
Thin films
Lattice mismatch
Substrates
thin films
Spin fluctuations
Superconducting transition temperature
Phase diagrams
Precipitates
precipitates
transition temperature
phase diagrams

Keywords

  • Bi-2212
  • Intrinsic Josephson junction
  • La-214
  • Strain effect
  • Thin films

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Influence of substrates on epitaxial thin films of high-temperature superconductors. / Sato, H.; Naito, M.; Tsukada, A.; Karimoto, S.; Matsuda, Azusa.

In: Physica C: Superconductivity and its Applications, Vol. 362, No. 1-4, 09.2001, p. 186-194.

Research output: Contribution to journalArticle

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AU - Karimoto, S.

AU - Matsuda, Azusa

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