Insulating vortex cores in disordered superconductors
Anushree Datta, Anurag Banerjee, Nandini Trivedi, Amit Ghosal
DOI 10.1103/PhysRevB.107.L140502 · Physical Review B
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Abstract
We show that while an orbital magnetic field and disorder, acting individually, weaken superconductivity, acting together they produce an intriguing evolution of a two-dimensional type-II s-wave superconductor. For weak disorder, the critical field Hc at which the superfluid density collapses is coincident with the field at which the superconducting energy gap gets suppressed. However, with increasing disorder these two fields diverge from each other, creating a pseudogap region with insulating vortex cores. Our results naturally explain two outstanding puzzles: the gigantic magnetoresistance peak observed as a function of magnetic field in thin disordered superconducting films and the disappearance of the celebrated zero-bias Caroli–de Gennes–Matricon peak in the local density of states at the vortex core in disordered superconductors.
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