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Possible Evidence for Berezinskii-Kosterlitz-Thouless Transition in Ba(Fe0.914Co0.086)2As2 Crystals
Wen-He Jiao1,2, Xiao-Feng Xu3, Hao Jiang4
1Interdisciplinary Center for Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Devices, Department of Physics, Zhejiang University, Hangzhou 310027, China.
This study reveals signatures of the Berezinskii-Kosterlitz-Thouless (BKT) transition in Ba(Fe,Co)2As2 crystals. Unbound vortices explain the observed non-Hall transverse signal at the superconducting transition.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- High-quality single crystals of Ba(Fe 0.914Co 0.086)2As2 are crucial for investigating fundamental superconducting properties.
- Understanding vortex dynamics is key to characterizing the nature of the superconducting state.
Purpose of the Study:
- To measure the in-plane transport properties of Ba(Fe 0.914Co 0.086)2As2 single crystals.
- To identify and analyze the signatures of the Berezinskii-Kosterlitz-Thouless (BKT) transition.
- To investigate the origin of the non-Hall transverse signal at the superconducting transition.
Main Methods:
- In-plane transport property measurements.
- Conventional analysis of vortex unbinding.
- Fisher-Fisher-Huse dynamic scaling analysis.
Main Results:
- Observed signatures consistent with the Berezinskii-Kosterlitz-Thouless (BKT) transition.
- Demonstrated a characteristic Nelson-Kosterlitz jump.
- Detected a non-Hall transverse signal precisely at the superconducting transition.
Conclusions:
- The results provide evidence for the BKT transition in the studied material.
- The non-Hall transverse signal is attributed to the guided motion of unbound vortices.
- This work deepens the understanding of vortex behavior in high-quality iron-based superconductors.
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