Anisotropies and Homogeneities of Superconducting Properties in Iron–Platinum–Arsenide Ca10(Pt3As8)(Fe1.79Pt0.21As2)5

We report a study on the anisotropy of superconducting properties in single crystalline Ca 10 (Pt 4-δ As 8 )(Fe 1.79 Pt 0.21 As 2 ) 5 with T c ∼13.6 K. Under a field of 5 Oe, the sample reaches fully-diamagnetic state at ∼10 K for H ∥ c , and ∼8 K for H ∥ a b , indicating the presence of slight inhomogeneities. The magnetization measurements reveal fish-tail effect in the hysteresis loop for both H ∥ c and H ∥ a b . Averaged critical current densities at low magnetic fields along the c -axis and a b -plane J c H || c and J c H || a b at 5 K are estimated to be 0.9×10 5 and 0.7×10 5 A/cm 2 , respectively. Resistive transitions under magnetic field show broadening, which is consistent with a relatively large anisotropy of upper critical field. Magneto-optical images reveal homogenous current flow within the a b -plane.

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