Superconducting Transition Temperature and Metal--Semiconductor Transition Temperature in
YBa2Cu4O8/La0.67Ca0.33MnO3/YBa2Cu4O8 Trilayer Films
ZHAO Kun1,2, HUANG Yan-Hong1, FENG Jia-Feng1, WONG Hong-Kuen3
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016
3Department of Physics, The Chinese University of Hong Kong, Hong Kong
Superconducting Transition Temperature and Metal--Semiconductor Transition Temperature in
YBa2Cu4O8/La0.67Ca0.33MnO3/YBa2Cu4O8 Trilayer Films
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016
3Department of Physics, The Chinese University of Hong Kong, Hong Kong
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.
ZHAO Kun;HUANG Yan-Hong;FENG Jia-Feng;WONG Hong-Kuen. Superconducting Transition Temperature and Metal--Semiconductor Transition Temperature in
YBa2Cu4O8/La0.67Ca0.33MnO3/YBa2Cu4O8 Trilayer Films[J]. 中国物理快报, 2004, 21(12): 2514-2517.
ZHAO Kun, HUANG Yan-Hong, FENG Jia-Feng, WONG Hong-Kuen. Superconducting Transition Temperature and Metal--Semiconductor Transition Temperature in
YBa2Cu4O8/La0.67Ca0.33MnO3/YBa2Cu4O8 Trilayer Films. Chin. Phys. Lett., 2004, 21(12): 2514-2517.
2004, Vol. 21 
