Quantitative characterization of the nanoscale local lattice strain induced by Sr Dopants in La1.92Sr0.08CuO4

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Authors

  • J. Q. Lin
  • X. Liu
  • S. Wakimoto
  • H. Ding
  • Z. Islam
  • S. K. Sinha

Colleges, School and Institutes

Abstract

The nanometer scale lattice deformation brought about by the dopants in the high temperature superconducting cuprate La2−xSrxCuO4 (x ¼ 0.08) was investigated by measuring the associated x-ray diffuse scattering around multiple Bragg peaks. A characteristic diffuse scattering pattern was observed,
which can be well described by continuum elastic theory. With the fitted dipole force parameters, the acoustic-type lattice deformation pattern was reconstructed and found to be of similar size to lattice thermal vibration at 7 K. Our results address the long-term concern of dopant introduced local lattice
inhomogeneity, and show that the associated nanometer scale lattice deformation is marginal and cannot, alone, be responsible for the patched variation in the spectral gaps observed with scanning tunneling
microscopy in the cuprates.

Details

Original languageEnglish
Article number197001
JournalPhysical Review Letters
Volume120
Issue number19
Publication statusPublished - 11 May 2018