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Evidence for a vortex-glass transition in superconducting Ba(Fe0.9Co0.1)2As2
G Prando1, R Giraud, S Aswartham
1Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 27, 2013
Summary
This study reveals dynamic scaling in superconducting Ba(Fe0.9Co0.1)2As2, showing a vortex-glass phase transition with weak quenched disorder. The findings suggest weaker disorder effects compared to cuprate superconductors.
Area of Science:
- Condensed Matter Physics
- Superconductivity Research
- Materials Science
Background:
- Superconducting materials like iron arsenides are crucial for technological applications.
- Understanding vortex dynamics and phase transitions is key to optimizing superconducting performance.
- Quenched disorder significantly impacts vortex behavior and superconducting properties.
Purpose of the Study:
- To investigate the dynamic scaling behavior near the vortex-glass phase transition in optimally doped Ba(Fe0.9Co0.1)2As2 single crystals.
- To analyze the role of quenched disorder introduced by chemical substitution on vortex dynamics.
- To compare the disorder effects in iron arsenides with those in cuprate superconductors.
Main Methods:
- Magneto-resistivity measurements on high-quality single crystals.
- AC magnetic susceptibility measurements.
- Analysis using Havriliak-Negami relaxation and critical power-law divergence for correlation time.
Main Results:
- Observed dynamic scaling behavior associated with a vortex-glass phase transition.
- Dissipative component of AC susceptibility well-described by Havriliak-Negami relaxation.
- Identified weaker quenched disorder effects in Ba(Fe0.9Co0.1)2As2 compared to cuprate superconductors.
Conclusions:
- The vortex-glass phase transition in Ba(Fe0.9Co0.1)2As2 exhibits dynamic scaling under weak quenched disorder.
- Chemical substitution introduces less severe quenched disorder in iron arsenides than in cuprates.
- This research provides insights into the fundamental physics of vortex matter in iron-based superconductors.
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