Complex conductivity of FeSe1-xTex(x = 0 - 0.5) films

Hodaka Kurokawa, Sota Nakamura, Jiahui Zhao, Naoki Shikama, Yuki Sakishita, Yue Sun, Fuyuki Nabeshima, Yoshinori Imai, Haruhisa Kitano, Atsutaka Maeda

Research output: Contribution to journalConference articlepeer-review


We measured the complex conductivity, σ, of the FeSe1-x Te x (x = 0 - 0.5) films below T c which show a drastic increase of the superconducting transition temperature, T c, when the nematic order disappears. Since the magnetic penetration depth, λ (> 400 nm) of Fe(Se, Te) is longer than the typical thickness of the film (∼100 nm), we combined the coplanar-waveguide-resonator- and cavity-perturbation techniques to evaluate both the real and imaginary parts of σ. Films with the nematic order showed a qualitatively different behavior of the quasiparticle scattering time compared with those without the nematic order, suggesting that the nematic order influences the superconducting gap structure. On the other hand, the proportionality between the superfluid density, n s/m∗ (∝ λ-2), and T c was observed irrespective of the presence or absence of the nematic order. This result indicates that the amount of the superfluid has a stronger impact on T c of Fe(Se, Te) than the presence or absence of the nematic order itself.

Original languageEnglish
Article number012009
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2021 Jul 30
Event33rd International Symposium on Superconductivity, ISS 2020 - Tsukuba, Japan
Duration: 2020 Dec 12020 Dec 3


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