Hybrid Pairing and Heavy Fermions

If the d–f exchange interaction is taken as the driving attractive interaction for a non-phonon hybrid pairing mechanism one gets results of surprising significance for heavy Fermion superconductors: a transition temperature one order of magnitude smaller than the single ion Kondo temperature, a large critical field initial slope, and a huge specific heat jump, whereas the ratio of the gap at zero temperature to kTc has the BCS value 3.53. Except for the relation between Tc and the Kondo temperature these statements remain to be true for any other hybrid pairing interaction of the same form. Wenn die d–f-Austauschwechselwirkung als die wirkende anziehende Wechselwirkung fur einen Nicht-Phonon-Hybridpaarungsmechanismus angeschen wird, erhalt man Ergebnisse von uberraschender Bedeutung fur schwere Fermionen-Supraleiter: eine Ubergangstemperatur, die eine Grosenordnung geringer als die Einionen-Kondo-Temperatur ist, einen grosen Anfangsanstieg des kritischen Feldes und einen grosen Sprung der spezifischen Warme, wahrend das Verhaltnis der Energielucke bei der Temperatur null zu kTc den BCS-Wert 3,53 hat. Auser fur die Beziehung zwischen Tc und der Kondotemperatur bleiben diese Feststellungen gultig fur jede andere Paarungswechselwirkung derselben Form.

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