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Title:
Enhancement of superconductivity due to magnetic fields in composite D-wave superconductors
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Abstract:
We study the response of composite D-wave superconductors to weak magnetic fields, at temperatures much lower than the bulk critical temperature. Such systems are formed by superconducting droplets, embedded into a normal metal host in a random fashion. Such system can be modeled as a network of XY spins, with strongly disordered Josephson couplings. We show that the application of a weak magnetic field enhances the superconducting fraction of the system in a non analytic way, as well as the critical temperature. This has to be compared with homogeneous superconductors, whose superconducting properties are always reduced by magnetic fields.
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