NMR measurements of the speed of vortices in flux flow in a type II superconductor

Abstract

The vortex motion in a type II superconductor narrows the inhomogeneous static NMR lineshape. This method gives a new way to study the flux flow of vortices in type II superconductors. In principle in a single crystal it can give a measure of the value and direction of the vortex speed. The NMR lineshape is discussed in the nonlinear flux creep region.