Volume 79, Number 1, July 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||20 June 2007|
Anomalous thermopower and Nernst effect in CeCoIn5: Loss of entropy current in precursor state
Department of Physics, Princeton University - Princeton, NJ 08544, USA
2 Department of Physics, Brookhaven National Laboratory - Upton, NY 11973, USA
Accepted: 30 May 2007
The heavy-electron superconductor CeCoIn5 exhibits a puzzling precursor state above its superconducting critical temperature at Tc = 2.3 K. The thermopower and Nernst signal are anomalous. Below 15 K, the entropy current of the electrons undergoes a steep decrease reaching ~0 at Tc. Concurrently, the off-diagonal thermoelectric current is enhanced. The delicate sensitivity of the zero-entropy state to field implies phase coherence over large distances. The prominent anomalies in the thermoelectric current contrast with the relatively weak effects in the resistivity and magnetization.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 72.15.Eb – Electrical and thermal conduction in crystalline metals and alloys / 74.70.Tx – Heavy-fermion superconductors
© Europhysics Letters Association, 2007
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