Thermoelectric response near a quantum critical point: the case of CeCoIn5.
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.
Izawa
K
K
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, Japan.
Behnia
K
K
Matsuda
Y
Y
Shishido
H
H
Settai
R
R
Onuki
Y
Y
Flouquet
J
J