Temperature dependence and limiting mechanisms of the upper critical field of FeSe thin films

Stanley, M.; Li, Y.; Palmstrom, J. C.; Thompson, J. L.; Halanayake, K. D.; Hickey, D. Reifsnyder; McDonald, R. D.; Crooker, S. A.; Trivedi, N.; Samarth, N.

doi:10.1103/physrevb.109.094514

Temperature dependence and limiting mechanisms of the upper critical field of FeSe thin films

Journal Article · Mon Mar 18 00:00:00 EDT 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.109.094514· OSTI ID:2563367

^[1]; Li, Y. ^[1]; ^[2]; ^[1]; ^[1]; ^[1]; McDonald, R. D. ^[2]; Crooker, S. A. ^[2]; Trivedi, N. ^[3]; ^[1]

Pennsylvania State University, University Park, PA (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). National High Magnetic Field Laboratory (MagLab)
The Ohio State University, Columbus, OH (United States)

We use magnetoresistance measurements at high magnetic field (μ_0⁢H ≤ 65 T) and low temperature (T ≥ 500 mK) to gain fresh insights into the behavior of the upper critical field H_c⁢2 in superconducting ultrathin FeSe films of varying degrees of disorder, grown by molecular beam epitaxy on SrTiO₃. Measurements of H_c⁢2 across samples with a widely varying superconducting critical temperature (1.2 K ≤ T_c ≤ 21 K) generically show similar qualitative temperature dependence. Here, we analyze the temperature dependence of H_c⁢2 in the context of Werthamer-Helfand-Hohenberg (WHH) theory. The analysis yields parameters that indicate a strong Pauli paramagnetic pair-breaking mechanism which is also reflected by pseudoisotropic superconductivity in the limit of zero temperature. In the lower T_c samples, we observe a spin-orbit scattering-driven enhancement of H_c⁢2 above the strongly-coupled Pauli paramagnetic limit. We also observe clear deviations from WHH theory at low temperature, regardless of T_c. We attribute this to the multiband superconductivity of FeSe and possibly to the emergence of a low-temperature, high-field superconducting phase.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2563367

Alternate ID(s):: OSTI ID: 2473859

Report Number(s):: LA-UR--23-32541

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 9 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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