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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 hole-like Fermi surfaces, and a strongly anisotropic gap on the electron-like 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:
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [1]
  1. Univ. of Illinois, Chicago, IL (United States)
  2. Univ. of Illinois, Chicago, IL (United States); Iowa State Univ., Ames, IA (United States)
  3. Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. Paris-Saclay, Gif-sur-Yvette (France)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of St. Andrews, Scotland (United Kingdom); Univ. College Cork (Ireland)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1412748
Report Number(s):
BNL-114711-2017-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PM015; KC0207010; TRN: US1800341
Grant/Contract Number:
SC0012704; 2009-BNL-PM015; FG02-05ER46225
Resource Type:
Journal Article: Accepted Manuscript
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. 2017. "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_1412748,
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 hole-like Fermi surfaces, and a strongly anisotropic gap on the electron-like 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 C2-symmetry in the Fourier transformed differential conductance.},
doi = {10.1103/PhysRevB.96.060504},
journal = {Physical Review B},
number = 6,
volume = 96,
place = {United States},
year = 2017,
month = 8
}

Journal Article:
Free Publicly Available Full Text
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