Abstract
The possibility of the existence of a nonuniform state is investigated, and the nature of the phase transition is determined in layered superconductors with Josephson-like interlayer coupling as a function of sample purity and temperature for a field parallel to the layers. The dependence of the upper critical field HK2(‖) on temperature and electron mean free path within the layers is obtained. At temperatures T < 0.55 Tc, it is shown that depending on the purity of the superconductor and the temperature, either a second-order phase transition into a nonuniform superconducting state or a first-order transition into a uniform superconducting state is observed in layered superconductors with Josephson interlayer coupling for a field parallel to the layers.
Published Version
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