Abstract
We have reexamined quasiparticle excitations in s-wave superconductors by considering a finite range ${T}_{d}$ of pairing interaction energy. When ${T}_{d}$ is finite, low-energy states which are believed to be a hallmark of other pairing symmetries such as d-wave symmetry are also found in s-wave superconductors. We have numerically computed (i) the quasiparticle density of states, (ii) the order parameter, (iii) the superfluid density as a function of ${T}_{d}{/T}_{c},$ and (iv) the critical temperature ${T}_{c}$ as a function of effective coupling constant. These calculations show unusual features which arise as a result of these low-energy states when ${T}_{d}$ becomes comparable to ${T}_{c}.$ In conventional superconductors, where ${T}_{d}{/T}_{c}\ensuremath{\gg}1,$ the BCS results are recovered as the effect of the low-energy states becomes negligible.
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