BaF2薄膜保护的YBaCuO薄膜的耐受性研究

本报告了在外延ＹＢａＣｕＯ薄膜表面淀积的ＢａＦ２薄膜对其超导性能的保护作用和破坏性实验的结果，经ＢａＦ２保护的超薄膜在３０分钟浸水及暴露大于气中长达５个月，超导转变温度仍保持８９Ｋ。     

交流偏置的高T_cdcSQUID的1／f噪声

我们把交流偏置反转技术应用于ｄｃＳＱＵＩＤｓ，观察了各级波形，测出了在交流偏置和直流偏置两种情况下ＹＢＣＯ双品结ｄｃＳＱＵＩＤｓ磁通噪声功率谱密度曲线．交流偏置使１／ｆ噪声显著降低，在ＳＨｚ下的磁通噪声功率谱密度由１×１０－６Φ２０／Ｈｚ降到了３×１０－８Φ２０／Ｈｚ．     

An／Sn周期性结构金属薄膜的弱局城电性

观测了金锡相间周期结构薄膜的弱局域效应（ＷＬ）现象．与经典现象不同，观察到了有效的自旋轨道散射弛豫时间。随温度明显的变化．在传统的ＷＬ的基础上，用一个简单的模型进行了解释．     

YBaCuO BICRYSTAL JUNCTIONS AND DC SUPERCONDUCTING QUANTUM INTERFERENCE DEVICES

We have prepared yttria-stabilized-zirconia bicrystal substrates using a simple hot-pressing method. The grain-boundary junctions have been fabricated with YBa₂Cu₃O₇ thin films grown epitaxially on the bicrystals. The patterns are defined by conventional photolithography, The dc and microwave characteristics of the junctiorts and the dc superconducting quantum interference devices (SQUIDs) have been intensively studied. The current-voltage curves are bridge-typed with noise rounding near the critical current. Resistive tail has been observed in the resistance versus temperature curves. The results are compared with the theoretical prediction for classical Josephson junctions. It is found that the behavior of bicrystal junctions can be described in the frame of classical theory. The deviations are attributed to the nonuniformity of the junctions. The small loop dc SQUIDs demonstrate diffraction and interference effects with regard to the applied magnetic field. A large square-washer with a new configuration has been designed to enhance the effective area of dc SQUID as a magnetometer. It has achieved a magnetic field resolution down to 1 pT/(Hz)^1/2(at 10Hz) at 77K.