TY - JOUR
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 - 2001/9/1
Y1 - 2001/9/1
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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U2 - 10.1016/S0921-4534(01)00668-2
DO - 10.1016/S0921-4534(01)00668-2
M3 - Article
AN - SCOPUS:0035449470
VL - 362
SP - 186
EP - 194
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 1-4
ER -