Multiband superconductivity in the heavy fermion compound PrOs4Sb12
  The thermal conductivity of the heavy fermion superconductor PrOs4Sb12 was measured down to Tc/40 throughout the vortex state. At lowest temperatures and for magnetic fields H ~ 0.07Hc2, already 40% of the normal state thermal conductivity is restored. This behaviour (similar to that observed in MgB2) is a clear signature of multiband superconductivity in this compound. 
Gabriel Seyfarth (CRTBT), Jean-Pascal Brison (CRTBT), Marie-Aude   M\'easson (DRFMC, SPSMS, Cea Grenoble), Jacques Flouquet ...