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Thermal activation energy of 3D vortex matter in NaFe1-xCoxAs (x=0.01, 0.03 and 0.07) single crystals

Title
Thermal activation energy of 3D vortex matter in NaFe1-xCoxAs (x=0.01, 0.03 and 0.07) single crystals
Authors
Choi, W. J.Seo, Y. I.Ahmad, D.Kwon, Yong Seung
DGIST Authors
Kwon, Yong Seung
Issue Date
2017-09
Citation
Scientific Reports, 7
Type
Article
Article Type
Article
Keywords
DopingFlux CreepHigh TC SuperconductorsHigh Temperature SuperconductorsLiquidLow TemperatureMagnetic FieldTemperature DependenceTransition
ISSN
2045-2322
Abstract
We report on the thermally activated flux flow dependency on the doping dependent mixed state in NaFe1-x Co x As (x = 0.01, 0.03, and 0.07) crystals using the magnetoresistivity in the case of B//c-axis and B//ab-plane. It was found clearly that irrespective of the doping ratio, magnetoresistivity showed a distinct tail just above the T c,offset associated with the thermally activated flux flow (TAFF) in our crystals. Furthermore, in TAFF region the temperature dependence of the activation energy follows the relation U (T, B) = U0 (B) (1 - T / Tc)q with q = 1.5 in all studied crystals. The magnetic field dependence of the activation energy follows a power law of U0(B) ∼ B-α where the exponent α is changed from a low value to a high value at a crossover field of B = ∼2 T, indicating the transition from collective to plastic pinning in the crystals. Finally, it is suggested that the 3D vortex phase is the dominant phase in the low temperature region as compared to the TAFF region in our series samples. © 2017 The Author(s).
URI
http://hdl.handle.net/20.500.11750/4996
DOI
10.1038/s41598-017-11371-1
Publisher
Nature Publishing Group
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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