Possible Evidence for Berezinskii–Kosterlitz–Thouless Transition in Ba(Fe<sub>0.914</sub>Co<sub>0.086</sub>)<sub>2</sub>As<sub>2</sub> Crystals
oleh: Wen-He Jiao, Xiao-Feng Xu, Hao Jiang, Zhu-An Xu, Qing-Hu Chen, Guang-Han Cao
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2021-10-01 |
Deskripsi
In this study, we measure the in-plane transport properties of high-quality Ba(Fe<sub>0.914</sub>Co<sub>0.086</sub>)<sub>2</sub>As<sub>2</sub> single crystals. Signatures of vortex unbinding Berezinskii–Kosterlitz–Thouless (BKT) transition are shown from both the conventional approach and the Fisher–Fisher–Huse dynamic scaling analysis, in which a characteristic Nelson–Kosterlitz jump is demonstrated. We also observe a non-Hall transverse signal exactly at the superconducting transition, which is explained in terms of guided motion of unbound vortices.