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Updated: Apr 1, 2026

Finite Element Modelling of a Cellular Electric Microenvironment
Published on: May 18, 2021
Possible mixed coupling mechanism in FeTe(1-x)Se(x) within a multiband Eliashberg approach
1Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy. National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashira Hwy 31, Moskva 115409, Russia.
Abstract:
We show that the phenomenology of the iron chalcogenide superconductor FeTe(1-x)Se(x) can be explained within an effective three-band s±-wave Eliashberg model. In particular, various experimental data reported in literature-the critical temperature, the energy gaps, the upper critical field, the superfluid density-can be reproduced by this model in a moderate strong-coupling regime provided that both an intraband phononic term and an interband antiferromagnetic spin-fluctuations term are included in the coupling matrix. The intraband coupling is unusual in Fe-based compounds and is required to explain the somehow anomalous association between gap amplitudes and Fermi surfaces, already evidenced by ARPES.
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