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Critical current density and lower critical field in a superconducting Ca-10(Pt4As8) (Fe2-x PtxAs2)(5) single crystal

Critical current density and lower critical field in a superconducting Ca-10(Pt4As8) (Fe2-x PtxAs2)(5) single crystal
Ahmad, D.Min, B. H.Lee, S.Kim, G. C.Kim, Y. C.Kwon, Yong Seung
DGIST Authors
Kwon, Yong Seung
Issued Date
Article Type
CalciumCritical Current DensityCritical Current Density (Superconductivity)Critical Current Density JcCrystal Growth From MeltFlux PinningHigh Quality Single CrystalsHigh Temperature SuperconductorsIron-Based SuperconductorIron-Based SuperconductorsIrreversibility Field HLower Critical FieldPlatinumSingle CrystalsSuperconducting GapsSuperconductivityTemperature DependenceVortex Phase Diagram
We investigate the critical current density Jc and the lower critical field Hc1 in a superconducting Ca10(Pt4As 8)(Fe2-xPtxAs2) 5 single crystal. High quality single crystals were grown by the Bridgman method. A sample with a nominal composition of Ca10(Pt4As8)(Fe 2-xPtxAs2)5 with x = 0.01 showed a Tc of 32 K. A well-formed secondary peak in the specific temperature range was observed in the magnetic hysteresis for H∥c and H∥ab, revealing the anisotropic nature of the flux pinning in the sample. The normalized volume pinning forces fp at various temperatures followed good fits with the scaling law fp ∝ hp(1 - h) q with p = 1 and q = 2, which predicts the normal point-type pinning in the sample. The vortex phase diagram shows that the irreversibility field Hirr , the secondary peak field Hsp, and the onset field of the secondary peak Hmin follow a universal scaling law H(T) = H(0)(1 - T /Tc)n. The temperature dependence of the superfluid density ρ̃(T) was fitted well by the two-gap BCS model in the full temperature range using two superconducting gaps, Δ1 = 8.4 ± 0.5 meV and Δ2 = 3.1 ± 0.5 meV. © 2014 IOP Publishing Ltd Printed in the UK.
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Related Researcher
  • 권용성 Kwon, Yong Seung 화학물리학과
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
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Department of Physics and Chemistry Quantum Functional Materials Laboratory 1. Journal Articles


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