Abstract
In this study, we measure the in-plane transport properties of high-quality Ba(Fe0.914Co0.086)2As2 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.
Highlights
Transition in Ba(Fe0.914 Co0.086 )2 As2Uncovering the underlying essential universality for high-temperature superconductivity is extremely important for understanding the superconducting mechanism as well as exploring the high-Tc materials [1]
Fe-based superconductors (FeSCs) show unusually small anisotropy in the upper critical field [4,5], which is in sharp contrast with Cu-based superconductors (CuSCs) [6]
There is no consensus on the nature of dimensionality in FeSCs [1], unlike the situation in CuSCs where the 2D characteristic is widely observed, [6] and the 2D nature is considered to be crucial for high-Tc superconductivity [7]
Summary
Uncovering the underlying essential universality for high-temperature superconductivity is extremely important for understanding the superconducting mechanism as well as exploring the high-Tc materials [1]. Kosterlitz–Thouless (BKT) topological phase transition [8] close to the mean-field superconducting transition temperature (TcMF ), even for the bulk crystals [9,10,11,12,13]. SmFeAsO polycrystals [21] and single crystals [22], while fluctuations in SmFeAsO0.8 F0.2 the evidence of BKT transition was reported in FeTe0.55Se0.45 thin films, suggesting a quasiwas reported to have a 3D character and extend far above Tc [24]. TBKT , pointing to the existence of thermally excited unbound vortices
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
