Magnetic and transport properties of iron-platinum arsenide   Ca10(Pt4-{\delta}As8)(Fe2-xPtxAs2)5 single crystal
  We report superconducting properties of single crystalline Ca10(Pt4-{\delta}As8)(Fe2-xPtxAs2)5 by X-ray diffraction, magnetization, resistivity, and magneto-optical imaging measurements. The magnetization measurements reveal fish-tail hysteresis loop and relatively high critical current density Jc ~ 0.8\times105 A/cm2 at low temperatures. The exponential temperature dependence of Jc, which arises from nonlinear effective flux-creep activation energy, has been observed. Upper critical field determined by resistive transition shows a relatively large anisotropy. The magneto-optical images reveal homogenous current flow within the crystal. 
Qing-Ping Ding, Yuji Tsuchiya, Shyam Mohan, Toshihiro Taen, Yasuyuki   Nakajima, Tsuyoshi Tamegai
cond-mat.supr-con cond-mat.str-el