We present a study of thermoelectric coefficients in CeCoIn_5 down to 0.1 K and up to 16 T in order to probe the thermoelectric signatures of quantum criticality. In the vicinity of the field-induced quantum critical point, the Nernst coefficient nu exhibits a dramatic enhancement without saturation down to lowest measured temperature. The dimensionless ratio of Seebeck coefficient to electronic specific heat shows a minimum at a temperature close to threshold of the quasiparticle formation. Close to T_c(H), in the vortex-liquid state, the Nernst coefficient behaves anomalously in puzzling contrast with other superconductors and standard vortex dynamics.
@article{arxiv.0704.1970,
title = {Thermoelectric response near a quantum critical point: the case of CeCoIn5},
author = {K. Izawa and K. Behnia and Y. Matsuda and H. Shishido and R. Settai and Y. Onuki and J. Flouquet},
journal= {arXiv preprint arXiv:0704.1970},
year = {2009}
}