Thermoelectric response near a quantum critical point: the case of CeCoIn5

Details Thermoelectric response near a quantum critical point: the case of CeCoIn5 Thermoelectric response near a quantum critical point: the case of CeCoIn5

2007-04-16

arxiv.org/abs/0704.1970v2

Phys. Rev. Lett. 99, 147005 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures,final published version

Scientific paper

10.1103/PhysRevLett.99.147005

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.

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