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We use magnetoresistance measurements at high magnetic field (B \leq 65 T)and low temperature (T \geq 500 mK) to gain fresh insights into the behavior ofthe upper critical field, Hc2, in superconducting ultrathin FeSe films ofvarying degrees of disorder, grown by molecular beam epitaxy on SrTiO3.Measurements of Hc2 across samples with a widely varying superconductingcritical temperature (1.2 K \leq Tc \leq 21 K) generically show similarqualitative temperature dependence. We analyze the temperature dependence ofHc2 in the context of Werthamer-Helfand-Hohenberg (WHH) theory. The analysisyields parameters that indicate a strong Pauli paramagnetic pair-breakingmechanism which is also reflected by pseudo-isotropic superconductivity in thelimit of zero temperature. In the lower Tc samples, we observe a spin-orbitscattering driven enhancement of Hc2 above the strongly-coupled Pauliparamagnetic limit. We also observe clear deviations from WHH theory at lowtemperature, regardless of Tc. We attribute this to the multi-bandsuperconductivity of FeSe and possibly to the emergence of a low temperature,high field superconducting phase.

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