Novel features in the flux-flow resistivity of the heavy fermion superconductor PrOs$_{4}$Sb$_{12}$

M. Kobayashi; H. Sato; H. Sugawara; H. Fujiwara; Y. Aoki

doi:10.1143/jpsj.74.1690

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Novel features in the flux-flow resistivity of the heavy fermion superconductor PrOs$_{4}$Sb$_{12}$

M. Kobayashi·H. Sato·H. Sugawara·H. Fujiwara·Y. Aoki

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Abstract

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 ($F_{\rm P}$). Estimated $F_{\rm P}$ 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 the specific heat and the multiple SC-phases inferred from the angular dependence of $κ$.

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M. Kobayashi, H. Sato, H. Sugawara, H. Fujiwara, Y. Aoki. 2005-07-19. Novel features in the flux-flow resistivity of the heavy fermion superconductor PrOs$_{4}$Sb$_{12}$. https://doi.org/10.1143/jpsj.74.1690

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