The critical rf magnetic field Hcʳᶠ of several type-I and type-II superconductors has been measured between 90 and 300 MHz and near Tc has been found to approach the ideal superheating field in nearly all cases. However, in the same samples the dc critical field shows little evidence of superheating. The temperature dependence of Hcʳᶠ suggests that rf-stimulated vortex nucleation occurs in the type-I materials.
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Yogi et al. (1977) studied this question.
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