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Title: Quasiparticle interference and symmetry of superconducting order parameter in strongly electron-doped iron-based superconductors

Abstract

Motivated by recent experimental reports of significant spin–orbit coupling (SOC) and a signchanging order-parameter in the Li1-xFex(OHFe)1-yZnySe superconductor with only electron pockets present, we study the possible Cooper-pairing symmetries and their quasiparticle interference (QPI) signatures.Wefind that each of the resulting states—s-wave, d-wave and helical p-wave—can have a fully gapped density of states consistent with angle-resolved photoemission spectroscopy experiments and, due to SOC, are a mixture of spin singlet and triplet components leading to intraand inter-band features in the QPI signal. Analyzing predicted QPI patterns we find that only the spintriplet dominated even parity A 1g (s-wave) and B 2g (d-wave) pairing states are consistent with the experimental data. Additionally, we show that these states can indeed be realized in a microscopic model with atomic-like interactions and study their possible signatures in spin-resolved STM experiments.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Russian Federation
OSTI Identifier:
1549199
Alternate Identifier(s):
OSTI ID: 1603845
Grant/Contract Number:  
FG02-05ER46236; ER 463/8-1; N57316180; K2-2017-085
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 21 Journal Issue: 8; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; unconventional superconductivity; iron-based systems; scanning tunneling spectroscopy; superconducting order parameter; spin–orbit coupling; phase sensitive probes

Citation Formats

Böker, Jakob, Volkov, Pavel A., Hirschfeld, P. J., and Eremin, Ilya. Quasiparticle interference and symmetry of superconducting order parameter in strongly electron-doped iron-based superconductors. United Kingdom: N. p., 2019. Web. https://doi.org/10.1088/1367-2630/ab2a82.
Böker, Jakob, Volkov, Pavel A., Hirschfeld, P. J., & Eremin, Ilya. Quasiparticle interference and symmetry of superconducting order parameter in strongly electron-doped iron-based superconductors. United Kingdom. https://doi.org/10.1088/1367-2630/ab2a82
Böker, Jakob, Volkov, Pavel A., Hirschfeld, P. J., and Eremin, Ilya. Thu . "Quasiparticle interference and symmetry of superconducting order parameter in strongly electron-doped iron-based superconductors". United Kingdom. https://doi.org/10.1088/1367-2630/ab2a82.
@article{osti_1549199,
title = {Quasiparticle interference and symmetry of superconducting order parameter in strongly electron-doped iron-based superconductors},
author = {Böker, Jakob and Volkov, Pavel A. and Hirschfeld, P. J. and Eremin, Ilya},
abstractNote = {Motivated by recent experimental reports of significant spin–orbit coupling (SOC) and a signchanging order-parameter in the Li1-xFex(OHFe)1-yZnySe superconductor with only electron pockets present, we study the possible Cooper-pairing symmetries and their quasiparticle interference (QPI) signatures.Wefind that each of the resulting states—s-wave, d-wave and helical p-wave—can have a fully gapped density of states consistent with angle-resolved photoemission spectroscopy experiments and, due to SOC, are a mixture of spin singlet and triplet components leading to intraand inter-band features in the QPI signal. Analyzing predicted QPI patterns we find that only the spintriplet dominated even parity A 1g (s-wave) and B 2g (d-wave) pairing states are consistent with the experimental data. Additionally, we show that these states can indeed be realized in a microscopic model with atomic-like interactions and study their possible signatures in spin-resolved STM experiments.},
doi = {10.1088/1367-2630/ab2a82},
journal = {New Journal of Physics},
number = 8,
volume = 21,
place = {United Kingdom},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/1367-2630/ab2a82

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