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Upper critical field (µ0Hc2) as a function of temperature of FeSe EDLT under applying VG = +4.0 V (Fig. 3D). (A) Least-square fitting result. (B) The estimated µ0Hc2 at 0 K using Werthamer–Helfand–Hohenberg theory (ref. 20 in the main text) is 70 T. α and λ denote Pauli spin paramagnetism and spin–orbit interaction parameters, respectively. Here, we select α = 0 and λ = 0.
