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Universality in Transport Processes of Unconventional Superconductors | | M. J. Graf
; S.-K. Yip
; J. A. Sauls
; | | Date: |
5 Sep 1996 | | Journal: | Czech. J. Phys. 46 (1996) S2 1005 | | Subject: | cond-mat | | Affiliation: | Northwestern University | | Abstract: | We show that some of the low temperature transport coefficients (e.g., electrical and thermal conductivities, viscosity and sound attenuation) are {it universal}, i.e., independent of the impurity concentration and phase shift for specific classes of unconventional superconductors. The existence of a universal limit depends on the symmetry of the order parameter and is achieved at low temperatures $k_B T ll gamma ll Delta_0$, where $gamma$ is the bandwidth of the impurity induced Andreev bound states. The density of states is finite at zero energy and leads to the re-appearance of the Wiedemann-Franz law deep in the superconducting phase for $k_B T ll gamma$. Our findings also show that impurity concentration studies at low temperatures can distinguish between different order parameter symmetries. | | Source: | arXiv, cond-mat/9609061 | | Services: | Forum | Review | PDF | Favorites | |
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