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Title: Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide FeSe 0.45 Te 0.55

Abstract

We demonstrate that the differential conductance, dI/dV, measured via spectroscopic imaging scanning tunneling microscopy in the doped iron chalcogenide FeSe0.45Te0.55, possesses a series of characteristic features that allow one to extract the orbital structure of the superconducting gaps. This yields nearly isotropic superconducting gaps on the two holelike Fermi surfaces, and a strongly anisotropic gap on the electronlike Fermi surface. Moreover, we show that the pinning of nematic fluctuations by defects can give rise to a dumbbell-like spatial structure of the induced impurity bound states, and explains the related C-2 symmetry in the Fourier transformed differential conductance.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1378324
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Sarkar, Saheli, Van Dyke, John, Sprau, Peter O., Massee, Freek, Welp, Ulrich, Kwok, Wai-Kwong, Davis, J. C. Seamus, and Morr, Dirk K. Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide FeSe0.45Te0.55. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.060504.
Sarkar, Saheli, Van Dyke, John, Sprau, Peter O., Massee, Freek, Welp, Ulrich, Kwok, Wai-Kwong, Davis, J. C. Seamus, & Morr, Dirk K. Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide FeSe0.45Te0.55. United States. doi:10.1103/PhysRevB.96.060504.
Sarkar, Saheli, Van Dyke, John, Sprau, Peter O., Massee, Freek, Welp, Ulrich, Kwok, Wai-Kwong, Davis, J. C. Seamus, and Morr, Dirk K. Tue . "Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide FeSe0.45Te0.55". United States. doi:10.1103/PhysRevB.96.060504.
@article{osti_1378324,
title = {Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide FeSe0.45Te0.55},
author = {Sarkar, Saheli and Van Dyke, John and Sprau, Peter O. and Massee, Freek and Welp, Ulrich and Kwok, Wai-Kwong and Davis, J. C. Seamus and Morr, Dirk K.},
abstractNote = {We demonstrate that the differential conductance, dI/dV, measured via spectroscopic imaging scanning tunneling microscopy in the doped iron chalcogenide FeSe0.45Te0.55, possesses a series of characteristic features that allow one to extract the orbital structure of the superconducting gaps. This yields nearly isotropic superconducting gaps on the two holelike Fermi surfaces, and a strongly anisotropic gap on the electronlike Fermi surface. Moreover, we show that the pinning of nematic fluctuations by defects can give rise to a dumbbell-like spatial structure of the induced impurity bound states, and explains the related C-2 symmetry in the Fourier transformed differential conductance.},
doi = {10.1103/PhysRevB.96.060504},
journal = {Physical Review B},
issn = {2469-9950},
number = 6,
volume = 96,
place = {United States},
year = {2017},
month = {8}
}

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