Universal parameters in the response of unconventional superconductors

This paper is devoted to a unified description of a large class of clean unconventional superconductors within a generalized weak coupling BCS model, applicable to the super-fluid phases of liquid exp 3 He, heavy Fermion and cuprate superconductors as well as the Ruddlesden-Popper system, Sr sub 2 R...

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Bibliographic Details
Published in:Journal of low temperature physics 2002-02, Vol.126 (3-4), p.867-879
Main Author: Einzel, D
Format: Article
Language:English
Online Access:Get full text
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Summary:This paper is devoted to a unified description of a large class of clean unconventional superconductors within a generalized weak coupling BCS model, applicable to the super-fluid phases of liquid exp 3 He, heavy Fermion and cuprate superconductors as well as the Ruddlesden-Popper system, Sr sub 2 RuO sub 4 . Gap nodes, leading to low energy (nodal) Bogoliuhov quasiparticles do not only modify the two universal so-called Muhlschlegel-BCS parameters, namely the specific heat discontinuity Delta C/C sub N at the transition and the gap maximum Delta sub 0 (0)/k sub B T sub c at zero temperature. They give rise also to the existence of a certain number of further universal parameters, namely the slopes or curvatures in the. temperature, dependence of the local response functions the low temperature limit, which vanish altogether in a conventional BCS description of isotropic s-wave pairing. All these parameters are calculated analytically for a large variety of model pairing states and, discussed with respect to their experimental observability.
ISSN:0022-2291
DOI:10.1023/A:1013886406749