Physics – Condensed Matter – Superconductivity
Scientific paper
2000-08-02
Physics
Condensed Matter
Superconductivity
28 pages, 13 figures
Scientific paper
10.1103/PhysRevB.63.024501
We have studied the effects of strong impurity scattering on disordered superconductors beyond the low impurity concentration limit. By applying the full CPA to a superconductiong A-B binary alloy, we calculated the fluctuations of the local order parameters $\Delta_{A}, \Delta_{B}$ and charge densities, $n_{A}, n_{B}$ for weak and strong on site disorder. We find that for narrow band alloy s-wav e superconductors the conditions for Anderson's theorem are satisfied in general only for the case of particle-hole symmetry. In this case it is satisfied regardless whether we are in the weak or strong scattering regimes. Interestingly, we find that strong scattering leads to band splitting and in this regime for any band filling we have a critical concentration where a superconductor-insulator quantum phase transition occurs at T=0.
Annett James F.
Györffy Balazs L.
Litak Grzegorz
Moradian Rostam
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