Novel Features in the Flux-Flow Resistivity of the Heavy Fermion Superconductor PrOs4Sb12

We have investigated the electrical resistivity of the heavy fermion superconductor PrOs 4 Sb 12 in the mixed state. We found unusual double minima in the flux-flow resistivity as a function of magnetic field below the upper critical field for the first time, indicating double peaks in the pinning force density ( F P ). Estimated F P at the peak exhibits apparent dependence on applied field direction composed of two-fold and four-fold symmetries mimicking the reported angular dependence of thermal conductivity (κ). The result is discussed in correlation with the double-step superconducting (SC) transition in specific heat and the multiple SC-phases inferred from the angular dependence of κ.

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