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 κ B T ≪ γ ≪ Δ0, where γ is the bandwidth of the impurity induced Andreev bound states. In the case of UPt3 thermal conductivity measurements favor anE 1g orE 2u ground state. Measurements at ultra-low temperatures should distinguish different pairing states.
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We thank the Max Planck Gesellschaft and the Alexander von Humboldt Stiftung for support. JAS also acknowledges partial support from the NSF through the Science and Technology Center for Superconductivity (DMR 91-20000).
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Sauls, J.A., Rainer, D. Unconventional pairing in heavy Fermion metals. Czech J Phys 46 (Suppl 6), 3089–3096 (1996). https://doi.org/10.1007/BF02548114
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DOI: https://doi.org/10.1007/BF02548114