Phase dependence of the Josephson current in inhomogeneous high-Tc grain-boundary junctions
Phase dependence of the Josephson current in inhomogeneous high-Tc grain-boundary junctions
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DOI：
10.1103/physrevb.59.11502
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发表时间：
1999-05-01
影响因子：
3.7
通讯作者：
Müller, P
中科院分区：
文献类型：
--
作者：
Il'ichev, E;Zakosarenko, V;Müller, P
我们对YBa2Cu3O7-x薄膜45度晶界的电流相关系I-s（phi）进行了实验和理论研究。一个强非均匀约瑟夫森结模型，其中随机交流电的存在导致I-s（phi）偏离众所周知的sin（phi）依赖，已经被使用。这个偏差随着温度T而减小，用公式I-s(phi) = I-c(T)（sin + γ (T)sin2）来描述。利用所建立的模型计算了伽马系数，发现其与温度的关系与实验结果吻合较好。[s0163 - 1829(99) 01417 - 4]。
We present an experimental and theoretical study of the current-phase relation I-s(phi) for 45 degrees grain boundaries in YBa2Cu3O7-x films. A model of strongly inhomogeneous Josephson junctions, in which the presence of randomly alternating current leads to a deviation of I-s(phi) from the well-known sin(phi) dependence, has been used. This deviation decreases with the temperature T and is described by the formula I-s(phi) = I-c(T)(sin phi + gamma(T)sin2 phi). Using the developed model, the coefficient gamma is calculated and its temperature dependence is found to be in good agreement with experiment. [S0163-1829(99)01417-4].