Pressure-dependent topological superconductivity on the surface of FeTe0.5Se0.5

FeTe1−xSex is a family of iron-based superconductors with its critical temperature (Tc) dependent on the composition of Se. A well-known Tc is 14.5 K for x = 0.45, which exhibits an s-wave superconducting gap between the topological superconducting surfaces states. Exchange interaction between the e...

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Bibliographic Details
Published in:New journal of physics 2022-02, Vol.24 (2), p.023001
Main Authors: Yang, Chih-Kai, Lee, Chi-Hsuan
Format: Article
Language:English
Subjects:
BCS theory
Cooper pairs
Electrons
Energy
exchange interaction
Experiments
iron-based superconductor
pairing mechanism
Physics
Pressure dependence
pressure variation
Superconductivity
Superconductors
Symmetry
Temperature dependence
topological superconductivity
Topology
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Summary:FeTe1−xSex is a family of iron-based superconductors with its critical temperature (Tc) dependent on the composition of Se. A well-known Tc is 14.5 K for x = 0.45, which exhibits an s-wave superconducting gap between the topological superconducting surfaces states. Exchange interaction between the electrons has been proposed as the mechanism behind the formation of Cooper pairs for the sample of FeTe0.5Se0.5. In this article we provide further proof that exchange interaction, and hence the associated Tc, depends on the applied pressure on FeTe0.5Se0.5. Using density functional calculations for electrons and phonons and the Bardeen–Cooper–Schrieffer (BCS) theory for superconductivity, we found that Tc and superconducting gap for FeTe0.5Se0.5 soars under increasing compression, consistent with the results of experiment.
ISSN:1367-2630
DOI:10.1088/1367-2630/ac4922