本文用对靶溅射技术制备了La2/3Ca1/3MnO3/YBa2Cu4O8/La2/3Ca1/3MnO3薄膜.与YBCO单层薄膜相比,由于超导/铁磁系统中的磁性邻近效应,三层薄膜表现出较低的超导转变温度.薄膜的R～T测量曲线显示出超磁阻(CMR)效应和超导转变,预示着超导和铁磁特性共存于LCMO/YBCO/LCMO三文治结构.
Trilayer films in which a superconducting YBa2Cu4O8 (YBCO) layer is sandwiched between two ferromagnetic La2/3Ca1/3MnO3 (LCMO) layers are formed by facing-target sputtering technique. The difference of superconducting transition temperature (Tc) between YBCO single layer and LCMO/YBCO/LCMO trilayers as functions of YBCO thickness is described by the magnetic proximity effect in superconductor/ferromagnet structure. Colossal magnetoresistance (CMR) effect and superconducting transition are shown in R～T curve, indicating the coexistence of superconductivity and ferromagnetism in the LCMO/YBCO/LCMO sandwich structures.
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