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Visualization of spatial inhomogeneity in the superconducting gap using micro-ARPES.

Yudai Miyai1, Shigeyuki Ishida2, Kenichi Ozawa3,4

  • 1Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Japan.

Science and Technology of Advanced Materials
|November 19, 2024
PubMed
Summary
This summary is machine-generated.

High-resolution spatially-resolved ARPES reveals micro-scale superconducting gap and scattering rate inhomogeneity in cuprate superconductors. This technique offers a data-driven approach to understanding complex material properties.

Keywords:
Angle-resolved photoemission spectroscopy (ARPES)gap inhomogeneityhigh-measurement informaticsmicro-ARPESspatially-resolved ARPES

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Electronic inhomogeneity is common in strongly correlated electron systems due to competing phases.
  • Gap inhomogeneity in high-temperature cuprate superconductors is well-documented via scanning tunneling microscopy/spectroscopy.
  • Angle-resolved photoemission spectroscopy (ARPES) has been limited in evaluating this inhomogeneity due to resolution constraints.

Purpose of the Study:

  • To investigate the spatial dependence of electronic states in optimally-doped Bi2Sr2CaCu2O8+δ using high-resolution ARPES.
  • To spatially map the superconducting gap and single-particle scattering rate at the micro-scale.
  • To statistically evaluate the correlations between these physical parameters.

Main Methods:

  • Utilized high-resolution spatially-resolved ARPES with a micrometric beam (micro-ARPES).
  • Performed detailed spectral lineshape analysis on the spatial mapping dataset.
  • Employed statistical evaluation of physical parameters and their correlations.

Main Results:

  • Revealed the spatial inhomogeneity of the superconducting gap at the micro-scale.
  • Identified spatial variations in the single-particle scattering rate.
  • Established correlations between the superconducting gap and scattering rate inhomogeneity.

Conclusions:

  • High-resolution spatially-resolved ARPES (micro-ARPES) is effective for probing micro-scale electronic inhomogeneity in cuprate superconductors.
  • This technique enables a data-driven approach to understanding complex material properties.
  • The findings provide key parameters for formulating physical properties of superconducting materials.