A phenomenological model is proposed which describes the effect of both dcand rf magnetic fields, $H$, on the microwave surface impedance, Z_s=R_s+jX_s,of a superconductor containing weak link. Two cases are considered; a weak linkbetween two grains, shunted by another grain, and a non-shunted weak link. Inboth cases the dependences of R_s and X_s on applied field H were found to beanomalous. Under certain conditions, the values of Z_s(H) can fall below thezero-field values. Comparison with experiment is performed, and very goodqualitative and (in some cases) quantitative agreement is found.
展开▼
机译：提出了一种现象学模型，该模型描述了直流磁场和射频磁场$ H $对包含弱链接的超导体的微波表面阻抗Z_s = R_s + jX_s的影响。考虑了两种情况；两个晶粒之间的一个弱连接（被另一个晶粒分流）和一个非分流的弱连接。在这两种情况下，都发现R_s和X_s对施加场H的依赖性是异常的。在某些条件下，Z_s（H）的值可能会低于零场值。进行了与实验的比较，并且发现了非常好的定性和（在某些情况下）定量一致。
展开▼
