Europhys. Lett.
Volume 75, Number 2, July 2006
Page(s) 308 - 314
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 16 June 2006
Europhys. Lett., 75 (2), pp. 308-314 (2006)
DOI: 10.1209/epl/i2006-10103-0

Exotic pairing instability in the heavy-fermion superconductor $\chem{CeCoIn_5}$

A. 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 $\chem{CeCoIn_5}$ 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 $T_{\ab{c}}$ 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).

© EDP Sciences 2006