Spatial inhomogeneities in disordered d-wave superconductors
Amit Ghosal, Mohit Randeria, Nandini Trivedi
DOI 10.1103/PhysRevB.63.020505 · Physical Review B
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Abstract
We study a short coherence length d-wave superconductor with a finite density of unitary scatterers using the Bogoliubov-deGennes technique. We find that the low-energy density of states is reduced, the superfluid stiffness is significantly larger, and off-diagonal long-range order is more robust than the conventional self-consistent T-matrix prediction. These results are a consequence of the inhomogeneous pairing amplitude in the ground state and of the low-lying excitations formed by hybridized impurity resonances. This inhomogeneous response accounts for the insensitivity of high-Tc superconductors to impurities.
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