LOCAL AC MAGNETIC RESPONSE IN TYPE-II SUPERCONDUCTORS

We present an analysis of the local ac magnetic response in type-II superconductors as measured by a miniature Hall probe. The results show that the response is a function of the position of the probe even in a homogeneous sample. The local response in an inhomogeneous sample is further influenced by local variations of superconducting properties across the sample. Applications of this analysis in characterizing and mapping of inhomogeneities in a sample are illustrated. © 1994 American Institute of Physics.