LOCAL-STRUCTURE OF SUPERCURRENT FLOW PAST AN IMPURITY

We discuss theoretical aspects of a uniform supercurrent flowing past an impurity in a conventional superconductor. In the vicinity of the impurity the order parameter and the current density are perturbed from their values at infinity. We present a detailed calculation of these distortions in the Ginzburg-Landau region close to T(c) using a version of the quasiclassical theory developed by Thuneberg. We then discuss the physical implications of these calculations.