Magnetoenhancement of superconductivity in composite D-wave superconductors

Abstract

We study composite D-wave superconductors consisting of randomly oriented and randomly distributed superconducting droplets embedded into a matrix. In a certain range of parameters the application of a small magnetic field enhances the superconductivity in these materials while larger fields suppress superconductivity as usual in conventional superconductors. We investigate the magnetic field dependence of the superfluid density and the critical temperature of such superconductors.

arXiv comment7 pages, 4 figures

References in corpus (7)

• Theory of quantum metal to superconductor transitions in highly conducting systems
• Theory of charge transport in diffusive normal metal / unconventional singlet superconductor contacts
• Giant magnetoresistance in the variable range hopping regime
• Ferromagnetic and random spin ordering in diluted magnetic semiconductors
• Macroscopic character of composite high temperature superconducting wires
• d-wave to s-wave to normal metal transitions in disordered superconductors
• The sign phase transition in the problem of interfering directed paths