Meissner response of superconductors with inhomogeneous penetration depths

Details Meissner response of superconductors with inhomogeneous penetration depths Meissner response of superconductors with inhomogeneous penetration depths

2011-03-23

arxiv.org/abs/1103.4553v2

Physics

Condensed Matter

Superconductivity

9 pages, 4 figures

Scientific paper

We discuss the Meissner response to a known field source of superconductors having inhomogeneities in their penetration depth. We simplify the general problem by assuming that the perturbations of the fields by the penetration depth inhomogeneities are small. We present expressions for inhomogeneities in several geometries, but concentrate for comparison with experiment on planar defects, perpendicular to the sample surfaces, with superfluid densities different from the rest of the samples. These calculations are relevant for magnetic microscopies, such as Scanning Superconducting Quantum Interference Device (SQUID) and Magnetic Force Microscope, which image the local diamagnetic susceptibility of a sample.

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