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Doping dependence of the vortex dynamics in single-crystal superconducting NaFe1-xCoxAs

Title
Doping dependence of the vortex dynamics in single-crystal superconducting NaFe1-xCoxAs
Authors
Ahmad, D.Choi, W. J.Seo, Y. I.Jung, S-GKim, Y. C.Salem-Sugui, S., Jr.Park, T.Kwon, Y. S.
DGIST Authors
Kwon, Y. S.
Issue Date
2017-10
Citation
Superconductor Science and Technology, 30(10)
Type
Article
Article Type
Article
Keywords
CuO CrystalsDefectElastic PinningFlux CreepIron Based SuperconductorLineMagnetizationPeakPeak EffectPlastic PinningTemperatureVortex DynamicsYBa2Cu3O7 X
ISSN
0953-2048
Abstract
We investigate the doping dependence of flux pinning in superconducting NaFe1-xCoxAs (x = 0.01, 0.03, 0.05 and 0.07) single crystals grown by the Bridgman method. The electronic specific heat displays a pronounced anomaly in a sample series at superconducting transition temperature, which hardly shows any residual part at low temperature. We found that Co doping plays an important role in signifying the secondary peak in the magnetic hysteresis of optimally doped (x = 0.03) and heavily doped (x = 0.05, 0.07) crystals. Furthermore, the dependence of the relaxation rate S = vertical bar d lnM / d ln t vertical bar on magnetic field and temperature exhibits a decreasing trend within a certain range corresponding to the secondary peak effect in the optimally and heavily doped samples. The magnetic relaxation rate combined with the Maley analysis of the current-dependent creep energy shows a single-vortex pinning in the lightly doped sample dominant at low applied fields, and plastic pinning at high applied fields, without showing a secondary peak. However, in the optimally and heavily doped samples, the magnetic relaxation rate and U(J) isothermal analysis show that the collective pinning that dominates below H-peak crosses over to plastic pinning for fields above H-peak.
URI
http://hdl.handle.net/20.500.11750/4993
DOI
10.1088/1361-6668/aa7ec3
Publisher
IOP PUBLISHING LTD
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:
Department of Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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