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Kim, Junsung
원자제어 저차원 전자계 연구단
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Enhanced vortex pinning with possible antiferromagnetic order in FeSe under pressure

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Title
Enhanced vortex pinning with possible antiferromagnetic order in FeSe under pressure
Author(s)
Kim, Ji-Hye; Ok, Jong Mok; Choi, Joonyoung; Kang, Woun; Jun Sung Kim; Jo, Younjung
Publication Date
2022-01-21
Journal
Physical Review B, v.105, no.3
Publisher
American Physical Society
Abstract
© 2022 American Physical Society.The strong coupling between magnetic, structural, and electronic degrees of freedom is a prominent feature of Fe-based superconductors. However, the relationship between the degrees of freedom and vortex dynamics remains unclear. In this paper, we measure the vortex pinning energy U0/kB within the thermally activated flux-flow regime with respect to the pressure-induced phases in a FeSe single crystal. We show that the dependence of U0/kB on pressure, measured at a magnetic field higher than the crossover field Hcr, follows a trend like those of critical temperature Tc(p) and the average Fermi velocity v¯F(p). On the other hand, at magnetic fields lower than Hcr, U0/kB increases remarkably before reaching the pressure at which antiferromagnetic (AFM) long-range order occurs. Our results suggest the presence of additional pinning sites, possibly AFM domain boundaries, correlated with the enhanced U0/kB. In addition, in this paper, we provide a universal description of the vortex dynamics in FeSe.
URI
https://pr.ibs.re.kr/handle/8788114/11263
DOI
10.1103/PhysRevB.105.035133
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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