Abstract
Motivated by the discovery of superconductivity in the two-leg, quasi-one-dimensional ladder compound , we present a renormalization group study of electrons moving on a two-leg, two-orbital ladder, subjected to Hubbard repulsion and Hund's coupling . 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 . 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.
8 More- Received 30 July 2018
- Revised 29 October 2018
DOI:https://doi.org/10.1103/PhysRevB.98.184517
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