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Solution of real-axis Eliashberg equations with different pair symmetries and tunneling density of states | | G.A. Ummarino
; R.S. Gonnelli
; D. Daghero
; | | Date: |
23 Dec 1999 | | Journal: | Physica C 341-348, 299 (2000) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | The real-axis direct solution of the Eliashberg equations for the retarded electron-boson interaction in the half-filling case and in the presence of impurities is obtained for six different symmetries of the order parameter: $s$, $s+mathrm{i}d$, $s+d$, $d$, anisotropic-$s$ and extended-$s$. The spectral function is assumed to contain an isotropic part $alpha_{is}^{2}F(Omega) $ and an anisotropic one $alpha_{an}^{2}F(Omega)$ such that $alpha_{is}^{2}F(Omega)=gcdotalpha_{an}^{2}F(Omega)$, where $g$ is a constant, and the Coulomb pseudopotential $mu^{ast}$ is set to zero for simplicity. The density of states is calculated for each symmetry at $T= 2, 4, 40$ and 80 K. The resulting curves are compared to those obtained by analytical continuation of the imaginary-axis solution of the Eliashberg equations and to the experimental tunneling curves of optimally-doped Bi 2212 crystals. | | Source: | arXiv, cond-mat/9912432 | | Services: | Forum | Review | PDF | Favorites | |
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