Magnetotransport properties of La2/3Ca1/3MnO3/YBa2Cu4O8/La2/3Ca1/3MnO3 sandwiches
Zhao Kun (赵昆)ab, Feng Jia-Feng (丰家峰)c, Huang Yan-Hong (黄延红)a, Wong Hong-Kuen (黄康权)d
a Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; b International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China; c State Key Laboratory for Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; d Department of Physics, The Chinese University of Hong Kong, Hong Kong, China
Abstract La2/3Ca1/3MnO3(LCMO)/YBa2Cu4O8(YBCO)/LCMO sandwiches are prepared by the facing-target sputtering technique. The superconducting transition temperature as a function of spacer layer thickness is described by the magnetic proximity effect in the superconductor/ferromagnet structure. The metal—semiconductor transition temperature exhibits a nonmonotonic behaviour which is strongly dependent upon the YBCO layer thickness, and is also shown from the measurement of resistance and magnetoresistance. These results imply that the magnetic spin interaction between the two LCMO layers may occur through the normal-conductive YBCO layer.
Received: 23 December 2003
Revised: 18 October 2004
Accepted manuscript online:
Fund: Project supported by the Hong Kong Research Grant Council and the National Natural Science Foundation of China (Grant Nos 50371102 and 10334070).
Cite this article:
Zhao Kun (赵昆), Feng Jia-Feng (丰家峰), Huang Yan-Hong (黄延红), Wong Hong-Kuen (黄康权) Magnetotransport properties of La2/3Ca1/3MnO3/YBa2Cu4O8/La2/3Ca1/3MnO3 sandwiches 2005 Chinese Physics 14 398
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