Co-operative Kondo Effect in the two-channel Kondo Lattice

Details Co-operative Kondo Effect in the two-channel Kondo Lattice Co-operative Kondo Effect in the two-channel Kondo Lattice

1998-11-02

arxiv.org/abs/cond-mat/9811006v1

Phys. Rev B, 60, 3608 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

23 double column pages. 9 figs

Scientific paper

10.1103/PhysRevB.60.3608

We discuss the possibility of a co-operative Kondo effect driven by channel interference in a Kondo lattice where local moments are coupled to a single Fermi sea via two orthogonal scattering channels. In this situation, the channel quantum number is not conserved. We argue that the absence of channel conservation causes the Kondo effect in the two channels to constructively interfere, giving rise to a superconducting condensate of composite pairs, formed between the local moments and the conduction electrons. Our arguments are based on the observation that a heavy Fermi surface gives rise to zero modes for Kondo singlets to fluctuate between screening channels of different symmetry, producing a divergent composite pair susceptibility. Secondary screening channels couple to these divergent fluctuations, promoting an instability into a state with long-range composite order. We present detailed a detailed mean-field theory for this superconducting phase, and discuss the possible implications for heavy fermion physics.

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