Nesting-induced local electronic patterns around a single As (Te, Se) vacancy in iron-based superconductors

The local electronic states around a single As (Te, Se) vacancy are investigated in order to shed light on the role of ligands in a series of iron-based superconductors. Such a vacancy can produce a local hopping correction ranging from −0.22 to 0.12 eV and always induce two in-gap resonance peaks i...

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Published in:New journal of physics 2018-05, Vol.20 (5), p.52001
Main Authors: Zhang, Degang, Liu, Zhihai, Ma, Jianming, Liu, Jiangshan, Xie, Zhengwei, Ting, C S
Format: Article
Language:English
Subjects:
Electron states
Fe-based superconductors
Fermi surfaces
Iron
ligand vacancy
Nesting
nesting effect
Order parameters
Physics
Tellurium
Vacancies
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creator Zhang, Degang
Liu, Zhihai
Ma, Jianming
Liu, Jiangshan
Xie, Zhengwei
Ting, C S
description The local electronic states around a single As (Te, Se) vacancy are investigated in order to shed light on the role of ligands in a series of iron-based superconductors. Such a vacancy can produce a local hopping correction ranging from −0.22 to 0.12 eV and always induce two in-gap resonance peaks in the local density of states (LDOS) at the fixed symmetrical bias voltages, which are rather robust and irrelevant to the phase of superconducting order parameter. The LDOS images near the defect predominantly possess 0° and 45° stripes. These energy-dependent charge modulations created by quasiparticle interference are originated in the nesting effect between the inner (outer) hole Fermi surface around Γ point and the inner (outer) electron Fermi surface around M point.
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subjects Electron states
Fe-based superconductors
Fermi surfaces
Iron
ligand vacancy
Nesting
nesting effect
Order parameters
Physics
Tellurium
Vacancies
title Nesting-induced local electronic patterns around a single As (Te, Se) vacancy in iron-based superconductors
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