Possible Pairing Symmetry in the FeSe-Based Superconductors Determined by Quasiparticle Interference

Yi Gao (高绎), Yuting Wang (王雨婷), Tao Zhou (周涛), Huaixiang Huang (黄怀湘), and Qiang-Hua Wang (王强华)

Phys. Rev. Lett. 121, 267005 – Published 28 December 2018

Abstract

We study the momentum-integrated quasiparticle interference (QPI) in the FeSe-based superconductors. This method was recently proposed theoretically and has been applied to determine the pairing symmetry in these materials experimentally. Our findings suggest that, if the incipient bands and the superconducting (SC) pairing on them are taken into consideration, then the experimentally measured bound states and momentum-integrated QPI can be well fitted, even if the SC order parameter does not change sign on the Fermi surfaces. Therefore, we offer an alternative explanation to the experimental data, calling for more careful identification of the pairing symmetry that is important for the pairing mechanism.

Received 19 August 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.267005

Physics Subject Headings (PhySH)

Multiband superconductivity

Chalcogenides Iron-based superconductors Pnictides

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yi Gao (高绎)^1,2, Yuting Wang (王雨婷)¹, Tao Zhou (周涛)³, Huaixiang Huang (黄怀湘)⁴, and Qiang-Hua Wang (王强华)^5,6

¹Center for Quantum Transport and Thermal Energy Science, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
²Jiangsu Key Lab on Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
³Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, and School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China
⁴Department of Physics, Shanghai University, Shanghai, 200444, China
⁵National Laboratory of Solid State Microstructures & School of Physics, Nanjing University, Nanjing, 210093, China
⁶Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

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Issue

Vol. 121, Iss. 26 — 28 December 2018

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