Exotic pairing instability in the heavy-fermion superconductorA. Bussmann-Holder1, A. Simon1 and A. R. Bishop2
1 Max-Planck-Institute for Solid State Research - Heisenbergstr.1, D-70569 Stuttgart Germany
2 Los Alamos National Laboratory, Theoretical Division - Los Alamos, NM 87545, USA
received 10 January 2006; accepted in final form 29 May 2006
published online 16 June 2006
Superconductivity in the heavy-fermion compound has recently been found to be due to multiple-band effects (Phys. Rev. Lett., 94 (2005) 107005) with a distinct two-gap structure. It is shown here that the enormously enhanced values of the gap ratios with respect to have an unusual origin with the electron dynamics mainly governed by f-p hybridization.
74.70.Tx - Heavy-fermion superconductors.
74.20.-z - Theories and models of superconducting state.
74.20.Rp - Pairing symmetries (other than s-wave).
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