Abstract
Through angle-resolved out-of-plane electrical transport measurements on K0.8Fe1.65Se2 crystals, it is found that the upper critical field Hc2, the out-of-plane resistivity ρc, and the activation energy U for flux motion all show a distinct fourfold symmetry which is probably related to the fourfold symmetric superconducting stripes arising from the special phase separation nature. A scaling approach was proposed to analyze the fourfold symmetry of Hc2, which fits the experimental data very well, and the fourfold symmetric behaviors of ρc in flux flow region were described by a modified Bardeen-Stephen equation after considering the phase separated stripes.
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