Renormalization group analysis for the quasi-one-dimensional superconductor BaFe2S3

Elio J. König, Alexei M. Tsvelik, and Piers Coleman
Phys. Rev. B 98, 184517 – Published 27 November 2018

Abstract

Motivated by the discovery of superconductivity in the two-leg, quasi-one-dimensional ladder compound BaFe2S3, we present a renormalization group study of electrons moving on a two-leg, two-orbital ladder, subjected to Hubbard repulsion U and Hund's coupling J. In our calculations, we adopt tight-binding parameters obtained from ab initio studies on this material. At incommensurate filling, the long-wavelength analysis displays four phases as a function of 0J/U<1. We show that a fully gapped superconductor is stabilized at sufficiently large Hund's coupling, the relative phases at the three Fermi points are “+,,”. By contrast, when the system is tuned to half-filling, umklapp scattering gives rise to Mott insulating phases. We discuss the general implications of our study for the broad class of iron-based superconductors.

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  • Received 30 July 2018
  • Revised 29 October 2018

DOI:https://doi.org/10.1103/PhysRevB.98.184517

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Elio J. König1, Alexei M. Tsvelik2, and Piers Coleman1,3

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
  • 2Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
  • 3Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom

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Issue

Vol. 98, Iss. 18 — 1 November 2018

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