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Vortex fluctuation effect evaluated using reversible magnetization in optimally doped single crystal NaFe0.97Co0.03As superconductor
- Vortex fluctuation effect evaluated using reversible magnetization in optimally doped single crystal NaFe0.97Co0.03As superconductor
- Ahmad, D.; Min, B. H.; Choi, W. J.; Salem-Sugui, S., Jr.; Mosqueira, J.; Kwon, Yong Seung
- DGIST Authors
- Kwon, Yong Seung
- Issue Date
- Superconductor Science and Technology, 27(12)
- Article Type
- Applied Magnetic Fields; Cobalt; Fluctuation Effects; High Temperature Superconductors; Iron-Based Superconductor; Iron-Based Superconductors; Irreversibility Lines; Magnetic Fields; Magnetic Properties; Magnetization; Reversible Magnetization; Single Crystals; Superconducting Transition Temperature; Temperature Dependence; Temperature Distribution; Universal Scaling; Vortex Flow; Vortex Fluctuations
- The reversible magnetization curves for various magnetic fields are investigated for a single crystal of the optimally doped NaFe0.97Co0.03As superconductor with the superconducting transition temperature Tc=20.9 K (ρ(T)=0) in the case where H is parallel to c-axis. A well-formed rounding effect is observed in the temperature dependence of the magnetization, and it widens on increasing the strength of the applied magnetic fields. At 20.2 K, we observe a crossing of the M(T) curves for different applied magnetic fields, indicating important fluctuation effects. The irreversibility line Hirr(T) obeys a universal scaling relation Hirr(T)=H0(1-T/Tc)ncharacterized by n∼1.537, which confirms the moderately anisotropic nature of the sample. The scaling analysis of the reversible magnetization in the region near Tc(H) supports the three-dimensional nature of the vortex fluctuations in NaFe0.97Co0.03As. © 2014 IOP Publishing Ltd.
- Institute of Physics Publishing
- Related Researcher
Kwon, Yong Seung
Quantum Functional Materials Laboratory
High Tc Superconductors and magnetic materials; Thermoelectric Materials
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