Striking similarities between HTSC and quasi-2D HF CeRIn5

We report our measurements of transport coefficients of quasi-2D HF CeRIn5 in the normal state, in the vicinity of a QCP and in the superconducting state. In the normal state, we observed a T-linear resistivity, a T2-dependence of cot θH (θH is the Hall angle), the violation of Kohler’s rule, and a giant Nernst coefficient. In the superconducting state, on the other hand, we found a rapid increase of the quasiparticle (QP) mean free path as the temperatures is reduced below Tc. The density of states (DOS) of delocalized QPs obtained from the thermal Hall coefficient is consistent with a d-wave pairing symmetry. Moreover, the angular dependence of thermal conductivity indicates that the gap function has a d-wave symmetry with line nodes perpendicular to the ab-plane. These results bear a striking resemblance to those obtained for the high-Tc cuprates. This similarity implies that the fluctuation and excitation spectrum near a 2D antiferromagnetic QCP could be universal.