Anomalous thermopower and Nernst effect in $\rm CeCoIn_5$: entropy-current loss in precursor state

Details Anomalous thermopower and Nernst effect in $\rm CeCoIn_5$: entropy-current loss in precursor state Anomalous thermopower and Nernst effect in $\rm CeCoIn_5$: entropy-current loss in precursor state

2007-05-07

arxiv.org/abs/0705.0928v1

Europhys. Lett. 79, 17006 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 figures, 4 pages

Scientific paper

10.1209/0295-5075/79/17006

The heavy-electron superconductor CeCoIn$_5$ exhibits a puzzling precursor state above its superconducting critical temperature at $T_c$ = 2.3 K. The thermopower and Nernst signal are anomalous. Below 15 K, the entropy current of the electrons undergoes a steep decrease reaching $\sim$0 at $T_c$. Concurrently, the off-diagonal thermoelectric current $\alpha_{xy}$ 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.

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