CMT81
Unconventional Pairing in Heavy Fermion Metals
- Author(s):
J. A. Sauls and D. Rainer
- Date: September 1996
- Journal:
Czech J Phys (1996) 47, 3089-3096
[DOI]
[PDF]
- Comment:
Invited Paper for the Proceedings of the 21st International Conference on Low Temperature Physics,
Prague, August 8-14, 1996; 8 pages, 5 figures.
- Abstract:
The Fermi-liquid theory of superconductivity is applicable to a broad range of systems that are candidates
for unconventional pairing,e.g. heavy fermion, organic and cuprate superconductors. Ginzburg-Landau theory
provides a link between the thermodynamic properties of these superconductors and Fermi-liquid theory. The
multiple superconducting phases of UPt3 illustrate the role that is played by the Ginzburg-Landau theory in
interpreting these novel superconductors. Fundamental differences between unconventional and conventional
anisotropic superconductors are illustrated by the unique effects that impurities have on the low-temperature
transport properties of unconventional superconductors. For special classes of unconventional superconductors
the low-temperature transport coefficients areuniversal, i.e. independent of the impurity concentration and
scattering phase shift. The existence of a universal limit depends on the symmetry of the order parameter and
is achieved at low temperatures kBT << γ << Δ0, where γ
is the bandwidth of the impurity induced Andreev bound states. In the case of UPt3 thermal conductivity
measurements favor an E1g or E2u ground state. Measurements at ultra-low temperatures
should distinguish different pairing states.
-
Eprint:
[PDF]
[arXiv]
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