Energy gap in superconductors with singular asymmetric density of states
S. Takács
DOI 10.1103/PhysRevB.46.3145 · Physical Review B
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Abstract
The ratio R=2Δ0/kTc is calculated for δ-function singularities in the density of states. Both symmetric and asymmetric densities of states are considered. In accordance with the symmetric powerlike singularities [D.C. Mattis and M. Molina, Phys. Rev. B 44, 12 565 (1991)], it is shown that neither the symmetric nor the asymmetric singularities in the density of states can explain those experimentally observed values in high-Tc superconductors that are much higher than the BCS value of 3.52 in the weak-coupling limit.
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