Doping-induced in-plane anisotropy of bond-stretching phonon softening in oxychloride Ca2-xCuO2Cl2 compounds

Blair W. Lebert, Hajime Yamamoto, Masaki Azuma, Rolf Heid, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q.R. Baron, Benoît Baptiste, Matteo D'Astuto

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1 Citation (Scopus)

Abstract

We measure the dispersion of the Cu-O bond-stretching phonon mode in the high-temperature superconducting parent compound Ca2CuO2Cl2. Our density functional theory calculations predict a cosine-shaped bending of the dispersion along both the (ζ00) and (ζζ0) directions, while comparison with previous results on Ca1.84CuO2Cl2 show it only along (ζ00), suggesting an anisotropic effect which is not reproduced in calculation. Comparison with isostructural La2-xSrxCuO4 and literature suggests that these calculations reproduce well the dispersion in the overdoped regime.

Original languageEnglish
Article number020506
JournalPhysical Review B
Volume101
Issue number2
DOIs
Publication statusPublished - 2020 Jan 22
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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