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s± pairing near a Lifshitz transition

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep32078· OSTI ID:1311242
 [1];  [2];  [3]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
Observations of robust superconductivity in some of the iron based superconductors in the vicinity of a Lifshitz point where a spin density wave instability is suppressed as the hole band drops below the Fermi energy raise questions for spin-fluctuation theories. In this paper we discuss spin-fluctuation pairing for a bilayer Hubbard model, which goes through such a Lifshitz transition. Our results show s± pairing with a transition temperature that peaks beyond the Lifshitz point and a gap function that has essentially the same magnitude but opposite sign on the incipient hole band as it does on the electron band that has a Fermi surface.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Joint Institute for Computational Sciences (JICS)
Sponsoring Organization:
ORNL LDRD Director's R&D; USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1311242
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Anisotropic resonance modes emerging in an antiferromagnetic superconducting state journal September 2017
Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates journal August 2017
Possible high- T c superconductivity due to incipient narrow bands originating from hidden ladders in Ruddlesden-Popper compounds journal November 2017
Wide applicability of high- T c pairing originating from coexisting wide and incipient narrow bands in quasi-one-dimensional systems journal January 2018
Direct imaging of electron transfer and its influence on superconducting pairing at FeSe/SrTiO 3 interface journal March 2018
Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates text January 2017
Possible high-$T_c$ superconductivity due to incipient narrow bands originating from hidden ladders in Ruddlesden-Popper compounds text January 2017

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