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

H. Sato; M. Naito; A. Tsukada; S. Karimoto; A. Matsuda

doi:10.1016/S0921-4534(01)00668-2

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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 La_2-xM_xCuO₄ (M=Ba, Sr), the superconducting transition temperature (T_c) is modified by the strain due to the lattice mismatch between the film and the substrate. For the compressively strained (001) films of La_2-xSr_xCuO₄ and La_2-xBa_xCuO₄ on LaSrAlO₄ substrates, T_c reached 44 and 47 K, respectively, which are higher than the values for bulk samples. Moreover, the T_c-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 T_c 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 language	English
Pages (from-to)	186-194
Number of pages	9
Journal	Physica C: Superconductivity and its applications
Volume	362
Issue number	1-4
DOIs	https://doi.org/10.1016/S0921-4534(01)00668-2
Publication status	Published - 2001 Sept
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/S0921-4534(01)00668-2

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title = "Influence of substrates on epitaxial thin films of high-temperature superconductors",

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.",

keywords = "Bi-2212, Intrinsic Josephson junction, La-214, Strain effect, Thin films",

author = "H. Sato and M. Naito and A. Tsukada and S. Karimoto and A. Matsuda",

year = "2001",

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doi = "10.1016/S0921-4534(01)00668-2",

language = "English",

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journal = "Physica C: Superconductivity and its applications",

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T1 - Influence of substrates on epitaxial thin films of high-temperature superconductors

AU - Sato, H.

AU - Naito, M.

AU - Tsukada, A.

AU - Karimoto, S.

AU - Matsuda, A.

PY - 2001/9

Y1 - 2001/9

N2 - 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.

AB - 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.

KW - Bi-2212

KW - Intrinsic Josephson junction

KW - La-214

KW - Strain effect

KW - Thin films

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ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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