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Complex conductivity measurements spanning the entire temperature range, including the vicinity of Tc, were conducted on systematically varied FeSe₁-ₗTeₓ (x = 0 - 0. 5) very thin films. By applying a novel cavity measurement technique employing microwave electric fields parallel to FeSe₁-ₗTeₓ films, we observed distinct temperature-dependent alterations in superfluid fraction and quasiparticle scattering rate at the nematic boundary. These changes in the nematic boundary suggests variations in the superconducting gap structure between samples in the nematic and non-nematic phase. Moreover, fluctuation is visible up to 1. 2 Tc irrespective of nematic order, consistent with large superconducting fluctuations in iron chalcogenide superconductors reported previously in H. Takahashi et al, Phys. Rev. B 99, 060503 (R) (2019) and F. Nabeshima et al, Phys. Rev. B 97, 024504 (R) (2018).
Matsumoto et al. (Wed,) studied this question.