Incommensurate Phonon Anomaly and the Nature of Charge Density Waves in Cuprates

ORAL

Abstract

While charge density wave (CDW) instabilities are ubiquitous to superconducting cuprates, the different ordering wavevectors in various cuprate families have hampered a unified description of the CDW formation mechanism. Here we investigate the temperature dependence of the low energy phonons in the canonical CDW ordered cuprate La1.875Ba0.125CuO4. We discover that the phonon softening wavevector associated with CDW correlations becomes temperature dependent in the high-temperature precursor phase and changes from a wavevector of 0.238 reciprocal space units (r.l.u.) below the ordering transition temperature up to 0.3 r.l.u. at 300 K. This high-temperature behavior shows that ``214''-type cuprates can host CDW correlations at a similar wavevector to previously reported CDW correlations in non-``214'' type cuprates such as YBa2Cu3O6+x. This indicates that cuprate CDWs may arise from the same underlying instability despite their apparently different low temperature ordering wavevectors.

*This work is supported by the Center for Emergent Superconductivity and DOE Contract No. DE-SC00112704. The experiments were performed at BL43LXU in SPring-8, Japan.

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Presenters

  • Hu Miao

    • Brookhaven Natl Lab
    • Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory

Authors

  • Hu Miao

    • Brookhaven Natl Lab
    • Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory

  • Daisuke Ishigawa

    • JASRI/SPring-8
    • Materials Dynamics Laboratory, RIKEN SPring-8 Center

  • rolf Heid

    • Karlsruher Institut fur Technolog

  • Matthieu le Tacon

    • Max Planck Institute for Solid State Research
    • Karlsruhe Institute of Technology
    • Karlsruher Institut fur Technolog
    • Karlsruher Institut fur Technologie

  • Gilberto Fabbris

    • Brookhaven National Laboratory
    • Brookhaven Natl Lab
    • Advanced Photon Source, Argonne National Laboratory

  • Derek Meyers

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Brookhaven Natl Lab

  • Genda Gu

    • Brookhaven National Laboratory
    • Brookhaven National Labs
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory
    • Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory
    • Condensed Matter &materials Science, Brookhaven Natl Lab
    • Brookhaven Natl Lab
    • Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Brookhaven Natl. Lab
    • Brookhaven National Lab
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • brookhaven national laboratory

  • Alfred Baron

    • Riken/SPring-8
    • Riken SPring-8
    • Materials Dynamics Laboratory, RIKEN SPring-8 Center

  • Mark Dean

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Brookhaven Natl Lab
    • Department of Condensed Matter and Materials Science, Brookhaven National Laboratory