Superconducting Transition Temperature and Metal--Semiconductor Transition Temperature in
YBa2Cu4O8/La0.67Ca0.33MnO3/YBa2Cu4O8 Trilayer Films |
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Authors: | ZHAO Kun HUANG Yan-Hong FENG Jia-Feng WONG Hong-Kuen |
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Institution: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016
Department of Physics, The Chinese University of Hong Kong, Hong Kong |
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Abstract: | YBa2Cu4O8/La0.67Ca0.33MnO3/YBa2Cu4O8(YBCO/LCMO/YBCO) trilayer films were prepared by magnetron facing-target sputtering. For the first time, the oscillatory behaviour of superconducting transition temperature Tc,ON with the thickness of LCMO (dL) has been observed. The strongest nonmonotonic information in the Tc,ON--dL curves appears clearly when dL is larger than the critical thickness dLCR. The metal--semiconductor transition temperature can only be detected at dL>dLCR. The dependence on the ferromagnetic spacer layer in YBCO/LCMO/YBCO systems suggests strongly the interplay of ferromagnetic and superconducting couplings. |
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Keywords: | 74 78 Bz 75 47 Gk 71 70 Gm |
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