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Title: Quantum Spin Liquid Intertwining Nematic and Superconducting Order in Fese

Journal Article · · Physical Review Letters
 [1];  [2];  [3]
  1. Cornell Univ., Ithaca, NY (United States); DOE/OSTI
  2. Binghamton Univ., Vestal, NY (United States); Cornell Univ., Ithaca, NY (United States); Univ. of California, Santa Barbara, CA (United States)
  3. Cornell Univ., Ithaca, NY (United States); Univ. of California, Santa Barbara, CA (United States)

Despite its seemingly simple composition and structure, the pairing mechanism of FeSe remains an open problem due to several striking phenomena. Among them are nematic order without magnetic order, nodeless gap and unusual inelastic neutron spectra with a broad continuum, and gap anisotropy consistent with orbital selection of unknown origin. Here we propose a microscopic description of a nematic quantum spin liquid that reproduces key features of neutron spectra. We then study how the spin fluctuations of the local moments lead to pairing within a spin-fermion model. We find the resulting superconducting order parameter to be nodeless s ± d wave within each domain. Further we show that orbital dependent Kondo-like coupling can readily capture observed gap anisotropy. Furthermore, our prediction calls for inelastic neutron scattering in a detwinned sample.

Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0010313
OSTI ID:
1611391
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 121; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Nematicity driven by hybridization in iron-based superconductors text January 2013
Space group symmetry, spin-orbit coupling and the low energy effective Hamiltonian for iron based superconductors text January 2013
Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3 text January 2013
Computation of dynamical correlation functions of the spin-1 Babujan-Takhtajan chain text January 2014
Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor text January 2014
Anomalous Fermi surface in FeSe seen by Shubnikov-de Haas oscillation measurements text January 2014
Field-induced superconducting phase of FeSe in the BCS-BEC cross-over text January 2014
Antiferroquadrupolar and Ising-Nematic Orders of a Frustrated Bilinear-Biquadratic Heisenberg Model and Implications for the Magnetism of FeSe text January 2015
Emergence of the nematic electronic state in FeSe text January 2015
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Spin excitations in a model of FeSe with orbital ordering text January 2015
Magnetic ground state of FeSe text January 2015
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Thermal Conductivity of the Iron-Based Superconductor FeSe : Nodeless Gap with Strong Two-Band Character text January 2016
High Temperature Superconductivity in Iron Pnictides and Chalcogenides text January 2016
Electronic quasiparticles in the quantum dimer model: density matrix renormalization group results text January 2016
Low-energy microscopic models for iron-based superconductors: a review text January 2016
Interplay between magnetism, superconductivity, and orbital order in a 5-pocket model for iron-based superconductors - a parquet renormalization group study text January 2016
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Cited By (4)

Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe journal January 2020
Anisotropic spin fluctuations in detwinned FeSe journal May 2019
Itinerant approach to magnetic neutron scattering of FeSe: Effect of orbital selectivity journal December 2018
Anisotropic spin fluctuations in detwinned FeSe text January 2019