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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, and Matteo d'Astuto
Phys. Rev. B 101, 020506(R) – Published 22 January 2020
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    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 (ξ00) and (ξξ0) directions, while comparison with previous results on Ca1.84CuO2Cl2 show it only along (ξ00), 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.

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    • Received 19 April 2019
    • Revised 16 September 2019
    • Corrected 16 December 2020

    DOI:https://doi.org/10.1103/PhysRevB.101.020506

    ©2020 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Electron-phonon couplingImpurities in superconductorsSuperconducting phase transition
    1. Physical Systems
    CupratesHigh-temperature superconductors
    1. Techniques
    Density functional calculationsMethods in superconductivityX-ray scattering
    Condensed Matter, Materials & Applied Physics

    Corrections

    16 December 2020

    Correction: A more specific citation explanation for Ref. [46] was inserted.

    Authors & Affiliations

    Blair W. Lebert1, Hajime Yamamoto2, Masaki Azuma2, Rolf Heid3, Satoshi Tsutsui4, Hiroshi Uchiyama4, Alfred Q. R. Baron5, Benoît Baptiste1, and Matteo d'Astuto1,6,*

    • 1IMPMC, UMR CNRS 7590, Sorbonne Universités-UPMC University Paris 06, MNHN, IRD, 4 Place Jussieu, F-75005 Paris, France
    • 2Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
    • 3Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany
    • 4Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
    • 5Materials Dynamics Laboratory, RIKEN SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo Hyogo 679-5148
    • 6Institut NEEL CNRS/UGA UPR2940, 25 rue des Martyrs BP 166, 38042 Grenoble cedex 9

    • *matteo.dastuto@neel.cnrs.fr

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    Issue

    Vol. 101, Iss. 2 — 1 January 2020

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