Physics – Condensed Matter – Superconductivity
Scientific paper
1999-01-18
Phys. Rev. B 60, 7532 (1999).
Physics
Condensed Matter
Superconductivity
35 pages, 23 figures, submitted to Phys Rev. B
Scientific paper
10.1103/PhysRevB.60.7523
A Coherent Potential Approximation is developed for s-wave and d-wave superconductivity in disordered systems. We show that the CPA formalism reproduces the standard pair-breaking formula, the self-consistent Born Approximation and the self-consistent T-matrix approximation in the appropriate limits. We implement the theory and compute T_c for s-wave and d-wave pairing using an attractive nearest neighbor Hubbard model featuring both binary alloy disorder and a uniform distribution of scattering site potentials. We determine the density of states and examine its consequences for low temperature heat capacity. We find that our results are in qualitative agreement with measurements on Zn doped YBCO superconductors.
Annett James F.
Györffy Balazs L.
Litak Grzegorz
Martin Andrew M.
Wysokinski Karol Izydor
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