Two-Dome Superconductivity in FeS Induced by a Lifshitz Transition

Makoto Shimizu, Nayuta Takemori, Daniel Guterding, Harald Olaf Jeschke

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Among iron chalcogenide superconductors, FeS can be viewed as a simple, highly compressed relative of FeSe without nematic phase and with weaker electronic correlations. Under pressure, however, the superconductivity of stoichiometric FeS disappears and reappears, forming two domes. We perform electronic structure and spin fluctuation theory calculations for tetragonal FeS in order to analyze the nature of the superconducting order parameter. In random phase approximation we find a gap function with d-wave symmetry at ambient pressure, in agreement with several reports of a nodal superconducting order parameter in FeS. Our calculations show that as function of pressure, the superconducting pairing strength decreases until a Lifshitz transition takes place at 4.6 GPa. As a hole pocket with large density of states appears at the Lifshitz transition, the gap symmetry is altered to sign-changing s-wave. At the same time the pairing strength is severely enhanced and increases up to a new maximum at 5.5 GPa. Therefore, our calculations naturally explain the occurrence of two superconducting domes in FeS.
Original languageEnglish
Article number137001
Pages (from-to)137001
JournalPhysical Review Letters
Volume121
Issue number13
DOIs
Publication statusPublished - Sep 28 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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