Abstract
Properties of the surface sheath of type I (κ > 0.42) and type II superconducting plates ( 1 √2 < κ < 2 ) in a parallel magnetic field are investigated. It is shown that the changing external magnetic field induces currents in the surface sheath which lead to hysteretic behaviour in the real part of the surface impedance R as a function of the applied field. The shielding of the bulk is most pronounced near the thermodynamical critical field H c, in qualitative agreement with recent work by Fink. The shielding properties in decreasing field seem to break down at H c, even in type II material with κ below a critical value. In an increasing field the bulk type I superconductor remains ideally diamagnetic up to a field higher than H c.
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