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Title: Renormalization group analysis for the quasi-1D superconductor BaFe2S3

Journal Article · · Physical Review B
 [1]; ORCiD logo [2];  [3]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Rutgers Univ., Piscataway, NJ (United States); Univ. of London, Surrey (United Kingdom)

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 0 ≤ J/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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; FG02-99ER45790
OSTI ID:
1483243
Alternate ID(s):
OSTI ID: 1483453; OSTI ID: 1509946
Report Number(s):
BNL-209474-2018-JAAM
Journal Information:
Physical Review B, Vol. 98, Issue 18; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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