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Title: Universality of scanning tunneling microscopy in cuprate superconductors

Abstract

We consider the problem of local tunneling into cuprate superconductors, combining model-based calculations for the superconducting order parameter with wave function information obtained from first-principles electronic structure. For some time it has been proposed that scanning tunneling microscopy (STM) spectra do not reflect the properties of the superconducting layer in the CuO2 plane directly beneath the STM tip, but rather a weighted sum of spatially proximate states determined by the details of the tunneling process. These ``filter'' ideas have been countered with the argument that similar conductance patterns have been seen around impurities and charge ordered states in systems with atomically quite different barrier layers. Here we use a recently developed Wannier function-based method to calculate topographies, spectra, conductance maps, and normalized conductance maps close to impurities. We find that it is the local planar Cu dx2–y2 Wannier function, qualitatively similar for many systems, that controls the form of the tunneling spectrum and the spatial patterns near perturbations. Furthermore we explain how, despite the fact that STM observables depend on the materials-specific details of the tunneling process and setup parameters, there is an overall universality in the qualitative features of conductance spectra. In particular, we discuss why STM results onmore » Bi2Sr2CaCu2O8 (BSCCO) and Ca2–xNaxCuO2Cl2 (NaCCOC) are essentially identical.« less

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [5]
  1. Univ. of Florida, Gainesville, FL (United States); Indian Institute of Science, Bengaluru (India)
  2. Univ. Leipzig, Leipzig (Germany); Univ. of Copenhagen, Copenhagen (Denmark)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Copenhagen, Copenhagen (Denmark)
  5. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1484148
Alternate Identifier(s):
OSTI ID: 1410467
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 17; 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

Choubey, Peayush, Kreisel, Andreas, Berlijn, Tom, Andersen, Brian M., and Hirschfeld, Peter J. Universality of scanning tunneling microscopy in cuprate superconductors. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.174523.
Choubey, Peayush, Kreisel, Andreas, Berlijn, Tom, Andersen, Brian M., & Hirschfeld, Peter J. Universality of scanning tunneling microscopy in cuprate superconductors. United States. https://doi.org/10.1103/PhysRevB.96.174523
Choubey, Peayush, Kreisel, Andreas, Berlijn, Tom, Andersen, Brian M., and Hirschfeld, Peter J. Tue . "Universality of scanning tunneling microscopy in cuprate superconductors". United States. https://doi.org/10.1103/PhysRevB.96.174523. https://www.osti.gov/servlets/purl/1484148.
@article{osti_1484148,
title = {Universality of scanning tunneling microscopy in cuprate superconductors},
author = {Choubey, Peayush and Kreisel, Andreas and Berlijn, Tom and Andersen, Brian M. and Hirschfeld, Peter J.},
abstractNote = {We consider the problem of local tunneling into cuprate superconductors, combining model-based calculations for the superconducting order parameter with wave function information obtained from first-principles electronic structure. For some time it has been proposed that scanning tunneling microscopy (STM) spectra do not reflect the properties of the superconducting layer in the CuO2 plane directly beneath the STM tip, but rather a weighted sum of spatially proximate states determined by the details of the tunneling process. These ``filter'' ideas have been countered with the argument that similar conductance patterns have been seen around impurities and charge ordered states in systems with atomically quite different barrier layers. Here we use a recently developed Wannier function-based method to calculate topographies, spectra, conductance maps, and normalized conductance maps close to impurities. We find that it is the local planar Cu dx2–y2 Wannier function, qualitatively similar for many systems, that controls the form of the tunneling spectrum and the spatial patterns near perturbations. Furthermore we explain how, despite the fact that STM observables depend on the materials-specific details of the tunneling process and setup parameters, there is an overall universality in the qualitative features of conductance spectra. In particular, we discuss why STM results on Bi2Sr2CaCu2O8 (BSCCO) and Ca2–xNaxCuO2Cl2 (NaCCOC) are essentially identical.},
doi = {10.1103/PhysRevB.96.174523},
journal = {Physical Review B},
number = 17,
volume = 96,
place = {United States},
year = {Tue Nov 28 00:00:00 EST 2017},
month = {Tue Nov 28 00:00:00 EST 2017}
}

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Cited by: 12 works
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Works referencing / citing this record:

Charge trapping and super-Poissonian noise centres in a cuprate superconductor
journal, October 2018


Atomic manipulation of the gap in Bi 2 Sr 2 CaCu 2 O 8+x
journal, January 2020


Atomic manipulation of the gap in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+x}$
text, January 2020