Electrical and Thermal Transport Properties of Layered Superconducting Ca(Pt₄As8)((FePt)2As₂)₅ Single Crystal.

We have synthesized single crystals of iron-based superconducting Ca(Pt₄As₈)((FePt)₂As₂)₅ and performed extensive measurements on their transport properties. A remarkable difference in the behavior and a large anisotropy between in-plane and out-of-plane resistivity was observed. Disorder could explain the in-plane square-root temperature dependence resistivity, and interlayer incoherent scattering may contribute to the out-of-plane transport property. Along the ab plane, the estimated value of the coherence length is 15.5 Å. From measurements of the upper critical magnetic field H (T ≥ 20 K), we estimate H(0) = 313 T. Thermal conductivity for Ca(Pt₄As₈)((FePt)₂As₂)₅ is relatively small, which can be accounted for by the disorder in the crystal and the low-charge carrier density as verified by the Hall effect.