Role of Nematicity in Controlling Spin Fluctuations and Superconducting Tc in Bulk FeSe: arXiv:2005.07729 [cond-mat.str-el]

Research output: Contribution to journalArticle

Abstract

Bulk FeSe superconducts inside a nematic phase, that sets in through an orthorhombic distortion of the high temperature tetragonal phase. Bulk non-alloy tetragonal superconducting FeSe does not exist as yet. This raises the question whether nematicity is fundamental to superconductivity. We employ an advanced ab-initio ability and show that bulk tetragonal FeSe can, in principle, superconduct at almost the same Tc as the orthorhombic phase had that been the ground state. Further, we perform rigorous benchmarking of our theoretical spin susceptibilities against experimentally observed data over all energies and relevant momentum direction. We show that susceptibilities computed in both the tetragonal and orthorhombic phases already have the correct momentum structure at all energies, but not the desired intensity. The enhanced nematicity that simulates the correct spin fluctuation intensity can only lead to a maximum 10-15% increment in the superconducting Tc . Our results suggest while nematicity may be intrinsic property of the bulk FeSe, is not the primary force driving the superconducting pairing.
Original languageAmerican English
Number of pages5
JournalArXiv.org
StatePublished - 2020

Bibliographical note

See NREL/JA-5F00-84107 for paper as published in Physical Review B

NREL Publication Number

  • NREL/JA-5F00-79495

Keywords

  • bulk FeSe
  • nematicity
  • strongly correlated electrons
  • superconductivity

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