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We report thermal transport measurement of KxFe2-ySe2 superconducting singlecrystal. Significant peak anomaly in thermal conductivity is observed at nearlyTC/2 indicating a large phonon mean-free-path in the superconducting state. Thezero-temperature extrapolated thermoelectric power is smaller than the value intypical strongly correlated superconductors, implying large normalized Fermitemperature. In contrast to other iron superconductors, thermoelectric power inour sample does not exhibit significant anomalies. These findings indicate thatKxFe2-ySe2 is a weakly or intermediately correlated superconductor withoutsignificant Fermi surface nesting.

Thermoelectric studies of KxFe2-ySe2: weakly correlated superconductor