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

Title
Critical current density and lower critical field in a superconducting Ca-10(Pt4As8) (Fe2-x PtxAs2)(5) single crystal
Authors
Ahmad, D.Min, B. H.Lee, S.Kim, G. C.Kim, Y. C.Kwon, Yong Seung
DGIST Authors
Kwon, Yong Seung
Issue Date
2014-07
Citation
Superconductor Science and Technology, 27(7)
Type
Article
Article Type
Article
Keywords
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
ISSN
0953-2048
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/5253
DOI
10.1088/0953-2048/27/7/075011
Publisher
Institute of Physics Publishing
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
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Collection:
Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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