The heavy-electron superconductor CeCoIn5 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 ∼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.
ASJC Scopus subject areas
- Physics and Astronomy(all)