Thermoelectric studies of KxFe2-ySe2: weakly correlated superconductor

Details Thermoelectric studies of KxFe2-ySe2: weakly correlated superconductor Thermoelectric studies of KxFe2-ySe2: weakly correlated superconductor

2011-02-10

arxiv.org/abs/1102.2217v2

Phys. Rev. B 83, 174503 (2011)

Physics

Condensed Matter

Superconductivity

Revised version, 5 pages, 5 figures, Will appear in Physical Review B

Scientific paper

We report thermal transport measurement of KxFe2-ySe2 superconducting single crystal. Significant peak anomaly in thermal conductivity is observed at nearly TC/2 indicating a large phonon mean-free-path in the superconducting state. The zero-temperature extrapolated thermoelectric power is smaller than the value in typical strongly correlated superconductors, implying large normalized Fermi temperature. In contrast to other iron superconductors, thermoelectric power in our sample does not exhibit significant anomalies. These findings indicate that KxFe2-ySe2 is a weakly or intermediately correlated superconductor without significant Fermi surface nesting.

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