Inhomogeneous mixed state in superconductors with superlattices

The properties of vortex structures in superconductors with superlattices in the region of the upper critical field Hc2 are studied. It is shown that in this region a commensurate structure, in which the vortices are located at the minima and maxima of the periodic potential, is realized. When “slip bands” are present in the system, as happens, for example, in the case of one-dimensional superlattices, this leads to singularities in the thermodynamic characteristics (thermodynamic potential, magnetic susceptibility) as a function of the temperature: an oscillatory dependence for ai < ξ (T) (ai are the periods of the superlattice), a jump for a < ξ (T), etc. Similar features should also be observed in the resistance in the flux flow regime.

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