CMT78
Universality in Transport Processes of Unconventional Superconductors
- Author(s):
M. J. Graf, S. K. Yip and J. A. Sauls
- Date: September 1996
- Journal:
Czech J Phys (1996) 46: 1005
[DOI]
- Abstract:
We show that some of the low temperature transport coefficients (e.g., electrical and thermal conductivities,
viscosity and sound attenuation) are 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
kBT << Δ0 where γ 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
kBT << γ. Our findings also show
that impurity concentration studies at low temperatures can distinguish between different order parameter
symmetries.
- Comment:
Proceedings of the 21st International Conference on Low Temperature Physics,
Prague, August 8-14, 1996; 2 pages, 1 table, 1 figure.
- Eprint:
[PDF]
Return to index