Anisotropic vortex core in the nematic state in electron-doped iron-pnictide superconductors

Hong Yi Chen

doi:10.1016/j.physc.2023.1354282

Anisotropic vortex core in the nematic state in electron-doped iron-pnictide superconductors

Hong Yi Chen^*

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We investigated the vortex states in the electron-doped BaFe_1.8Co_0.2As₂ using Bogoliubov-de Gennes equations, based on a phenomenological model with competing nematic order and extended s-wave superconductivity. Specifically, we considered the spin-driven nematic order for the optimally doped compound. Our findings suggest that there are no Andreev bound states at the Fermi energy in the nematic phase, and the local density of states exhibits a double-peak structure, consistent with scanning tunneling microscopy experiments. Moreover, we propose an elliptic vortex structure in the local density of states map, which we attribute to the presence of the nematic order.

Original language	English
Article number	1354282
Journal	Physica C: Superconductivity and its applications
Volume	610
DOIs	https://doi.org/10.1016/j.physc.2023.1354282
Publication status	Published - 2023 Jul 15

Keywords

BdG equations
Nematic state
Vortex core

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/j.physc.2023.1354282

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title = "Anisotropic vortex core in the nematic state in electron-doped iron-pnictide superconductors",

abstract = "We investigated the vortex states in the electron-doped BaFe1.8Co0.2As2 using Bogoliubov-de Gennes equations, based on a phenomenological model with competing nematic order and extended s-wave superconductivity. Specifically, we considered the spin-driven nematic order for the optimally doped compound. Our findings suggest that there are no Andreev bound states at the Fermi energy in the nematic phase, and the local density of states exhibits a double-peak structure, consistent with scanning tunneling microscopy experiments. Moreover, we propose an elliptic vortex structure in the local density of states map, which we attribute to the presence of the nematic order.",

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AU - Chen, Hong Yi

PY - 2023/7/15

Y1 - 2023/7/15

N2 - We investigated the vortex states in the electron-doped BaFe1.8Co0.2As2 using Bogoliubov-de Gennes equations, based on a phenomenological model with competing nematic order and extended s-wave superconductivity. Specifically, we considered the spin-driven nematic order for the optimally doped compound. Our findings suggest that there are no Andreev bound states at the Fermi energy in the nematic phase, and the local density of states exhibits a double-peak structure, consistent with scanning tunneling microscopy experiments. Moreover, we propose an elliptic vortex structure in the local density of states map, which we attribute to the presence of the nematic order.

AB - We investigated the vortex states in the electron-doped BaFe1.8Co0.2As2 using Bogoliubov-de Gennes equations, based on a phenomenological model with competing nematic order and extended s-wave superconductivity. Specifically, we considered the spin-driven nematic order for the optimally doped compound. Our findings suggest that there are no Andreev bound states at the Fermi energy in the nematic phase, and the local density of states exhibits a double-peak structure, consistent with scanning tunneling microscopy experiments. Moreover, we propose an elliptic vortex structure in the local density of states map, which we attribute to the presence of the nematic order.

KW - BdG equations

KW - Nematic state

KW - Vortex core

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Anisotropic vortex core in the nematic state in electron-doped iron-pnictide superconductors

Abstract

Keywords

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