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

Böker, Jakob; Volkov, Pavel A.; Hirschfeld, P. J.; Eremin, Ilya

doi:10.1088/1367-2630/ab2a82

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

Journal Article · 18 June 2019 · New Journal of Physics

DOI: https://doi.org/10.1088/1367-2630/ab2a82 · OSTI ID:1549199

Böker, Jakob ^[1]; Volkov, Pavel A. ^[2]; Hirschfeld, P. J. ^[3]; Eremin, Ilya ^[4]

Ruhr-Universität Bochum (Germany)
Ruhr-Universität Bochum (Germany); Rutgers Univ., Piscataway, NJ (United States)
Univ. of Florida, Gainesville, FL (United States)
Ruhr-Universität Bochum (Germany); National Univ. of Science and Technology MISiS, Moscow (Russia)

Motivated by recent experimental reports of significant spin–orbit coupling (SOC) and a signchanging order-parameter in the Li_1-xFe_x(OHFe)_1-yZn_ySe 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.

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Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Russian Federation

Grant/Contract Number:: FG02-05ER46236; K2-2017-085; ER 463/8-1; N57316180

OSTI ID:: 1549199

Alternate ID(s):: OSTI ID: 1603845

Journal Information:: New Journal of Physics, Vol. 21, Issue 8; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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