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Related Experiment Videos

Dopant-modulated pair interaction in cuprate superconductors.

Tamara S Nunner1, Brian M Andersen, Ashot Melikyan

  • 1Department of Physics, University of Florida, Gainesville, Florida 32611, USA.

Physical Review Letters
|December 31, 2005
PubMed
Summary

Random dopant atoms in cuprates locally alter electron pair interactions. This disorder explains nanoscale electronic inhomogeneity in BSCCO-2212, impacting local electronic properties like gap magnitude.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Nanoscale electronic inhomogeneity is a key feature in cuprate superconductors like BSCCO-2212.
  • Understanding the role of disorder, particularly dopant atoms, is crucial for explaining these inhomogeneities.

Purpose of the Study:

  • To investigate the local impact of random out-of-plane dopant atoms on electronic properties in cuprates.
  • To correlate impurity atom positions with observed nanoscale electronic inhomogeneity.

Main Methods:

  • Comparison of experimental Scanning Tunneling Microscopy (STM) data.
  • Theoretical calculations using single-impurity and many-impurity Bogoliubov-de Gennes (BdG) models.

Main Results:

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  • Experimental STM data aligns with BdG calculations, indicating local modulation of pair interaction by dopant atoms.
  • The model successfully reproduces correlations between impurity positions and local density of states (LDOS) features, including gap magnitude and coherence peak height.
  • Dopant atoms influence pair interaction on a length scale of approximately one lattice constant.

Conclusions:

  • Random out-of-plane dopant atoms are a critical source of nanoscale electronic inhomogeneity in BSCCO-2212.
  • The local modulation of pair interaction by individual dopant atoms is a fundamental mechanism driving these electronic variations.