Abstract
We report superconducting properties of single crystalline Ca${}_{10}$(Pt${}_{4\ensuremath{-}\ensuremath{\delta}}$As${}_{8}$)(Fe${}_{2\ensuremath{-}x}$Pt${}_{x}$As${}_{2}$)${}_{5}$ by x-ray diffraction, magnetization, resistivity, and magneto-optical imaging measurements. The magnetization measurements reveal a fish-tail hysteresis loop and relatively high critical current density ${J}_{c}$ $\ensuremath{\sim}$ 0.8 $\ifmmode\times\else\texttimes\fi{}$ 10${}^{5}$ A/cm${}^{2}$ at low temperatures. The exponential temperature dependence of ${J}_{c}$, which arises from the nonlinear effective flux-creep activation energy, has been observed. The upper critical field determined by resistive transition shows a relatively large anisotropy. The magneto-optical images reveal a homogenous current flow within the crystal.
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