Thermoelectric response near a quantum critical point: the case of CeCoIn5 |
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Authors: | Izawa K Behnia K Matsuda Y Shishido H Settai R Onuki Y Flouquet J |
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Affiliation: | Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, Japan. |
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Abstract: | We present a study of thermoelectric coefficients in CeCoIn5 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 the lowest measured temperature. The dimensionless ratio of the Seebeck coefficient to the electronic specific heat shows a minimum at a temperature close to threshold of the quasiparticle formation. Close to Tc(H), in the vortex-liquid state, the Nernst coefficient behaves anomalously in puzzling contrast with other superconductors and standard vortex dynamics. |
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