@article{daabbdcd51c046e794f2f1f11086a60a,
title = "Doping-induced in-plane anisotropy of bond-stretching phonon softening in oxychloride Ca2-xCuO2Cl2 compounds",
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.",
author = "Lebert, {Blair W.} and Hajime Yamamoto and Masaki Azuma and Rolf Heid and Satoshi Tsutsui and Hiroshi Uchiyama and Baron, {Alfred Q.R.} and Beno{\^i}t Baptiste and Matteo D'Astuto",
note = "Funding Information: The synchrotron radiation experiments were performed at the BL35XU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2015B1720). The authors are very grateful to Lise-Marie Chamoreau for her assistance in sample orientation and acknowledge the use of the x-ray diffractometer instrument at the “Plateforme Diffraction,” IPCM, Paris. The authors thank Laura Chaix for critical reading of the manuscript. H.Y. is very grateful to Ikuya Yamada for advice on crystals growth. B.W.L. acknowledges financial support from the French state funds managed by the Agence Nationale de la Recherche (ANR) within the “Investissements d'Avenir” programme under reference ANR-11-IDEX-0004-02, and within the framework of the Cluster of Excellence MATISSE led by Sorbonne Universit{\'e} as well as from the LLB/SOLEIL PhD fellowship program. B.W.L. also acknowledges travel within Japan, housing and user fees covered by SPring-8 through the “Budding Researchers Support” program. M.d'A. acknowledges financial support from the Tokyo Tech World Research Hub Initiative (WRHI) Program of Institute of Innovative Research. Publisher Copyright: {\textcopyright} 2020 American Physical Society.",
year = "2020",
month = jan,
day = "22",
doi = "10.1103/PhysRevB.101.020506",
language = "English",
volume = "101",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "2",
}