Y. Onose et al 2007 EPL 79 17006 doi:10.1209/0295-5075/79/17006
Y. Onose1, Lu Li1, C. Petrovic2 and N. P. Ong1
Show affiliationsThe 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 αxy 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.
72.15.Eb Electrical and thermal conduction in crystalline metals and alloys
74.70.Tx Heavy-fermion superconductors
71.27.+a Strongly correlated electron systems; heavy fermions
Issue 1 (July 2007)
Received 8 May 2007, in final form 30 May 2007
Published 20 June 2007
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