ar X iv : c on d - m at / 9 30 50 17 v 1 1 7 M ay 1 99 3 Odd Frequency Pairing in the Kondo Lattice
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چکیده
We discuss the possibility that heavy fermion superconductors involve odd-frequency triplet pairing. A key technical innovation in this discussion is a Majorana representation for the local moments which enables the n f = 1 constraint in the Kondo lattice to be handled without a Gutzwiller approximation. Our mean field theory for odd frequency pairing involves a condensation of local moments and conduction electrons, and is characterized by a spinor order parameter. This is a stable realization of odd frequency triplet pairing. It predicts a Fermi surface of gapless quasiparticles, whose spin and charge coherence factors vanish linearly in energy. The unusual energy dependence of coherence factors leads to a T 3 NMR relaxation rate that coexists with a linear specific heat. A prediction of the theory is that a Korringa relaxation will fail to develop in heavy fermion superconductors, even in the limit of strong pair-breaking and severe gaplessness.
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تاریخ انتشار 1993