Enhanced vortex pinning with possible antiferromagnetic order in FeSe under pressure
- 주제(기타) Materials Science, Multidisciplinary
- 주제(기타) Physics, Applied
- 주제(기타) Physics, Condensed Matter
- 설명문(일반) [Kim, Ji-hye; Choi, Joonyoung; Jo, Younjung] Kyungpook Natl Univ, Dept Phys, Daegu 41566, South Korea; [Ok, Jong Mok; Kim, Jun Sung] Pohang Univ Sci & Technol POSTECH, Dept Phys, Pohang 37673, South Korea; [Ok, Jong Mok] Pusan Natl Univ, Dept Phys, Pusan 46241, South Korea; [Kang, Woun] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Kim, Jun Sung] Inst Basic Sci IBS, Ctr Artificial Low Dimens Elect Syst, Pohang 37673, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 AMER PHYSICAL SOC
- 발행년도 2022
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000190272
- 본문언어 영어
- Published As https://doi.org/10.1103/PhysRevB.105.035133
초록/요약
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 U-0/k(B) 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 U-0/k(B) on pressure, measured at a magnetic field higher than the crossover field Hcr, follows a trend like those of critical temperature T-c(p) and the average Fermi velocity v over line (upsilon) over bar (F)(p). On the other hand, at magnetic fields lower than H-cr, U-0/k(B) 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 U-0/k(B). In addition, in this paper, we provide a universal description of the vortex dynamics in FeSe.
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