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Fishtail Effect and the Upper Critical Field in a Superconducting Ca 1 0 (Pt 4 As 8 )(Fe 2 x Pt x As 2 ) 5


A single crystal of a superconducting Ca10(Pt4 As8)(Fe2−xPtxAs2)5 (x = 0.01) was grown by the Bridgman method. The transition temperature was 32 K. The penetration field, H p , was measured and the superconducting parameters, κ, λ, and ξ, were obtained from H p . A fitting function was derived for the field dependence of the magnetization (MH curve) including the fishtail effect and the secondary peak using a statistical method. The temperature dependence of the upper critical field, H c2, was obtained from the fitting function and H c2(0) was estimated to be 134 T. In addition, the SDW transition in the normal state is reported.

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This work was supported by a 2-year research grant of Pusan National University.

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Correspondence to Y. C. Kim.

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Yun, E.G., Ahmad, D., Kim, G.C. et al. Fishtail Effect and the Upper Critical Field in a Superconducting Ca 1 0 (Pt 4 As 8 )(Fe 2 x Pt x As 2 ) 5 . J Supercond Nov Magn 30, 2963–2969 (2017).

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  • Fish tail effect
  • Upper critical field
  • Ca10(Pt4As8)(Fe2−xPtxAs2)5