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Phonon Dispersion Measurements of YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy

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Abstract

We measured the phonon dispersions of YBa2Cu3O6.15 and YBa2Cu3O6.95 by time-of-flight inelastic neutron scattering. The in-plane bond-stretching modes in the metallic phase showed a distinct a-b plane anisotropy beyond what is expected for structural origin. Such anisotropy in the longitudinal optical modes, which is absent in the TO, suggests strong in-plane anisotropy in the underlying electronic structure. Apical oxygen bond-stretching modes showed a large frequency change between the insulating and the metallic phases. This large softening also is beyond structural origin, and suggests the effect of local electronic environment.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104

    J.-H. Chung & T. Egami

  2. Los Alamos National Laboratory, Los Alamos, New Mexico, 87545

    R. J. McQueeney & H. A. Mook

  3. Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831

    M. Yethiraj

  4. Institute of Materials Structure Science, KEK, Tsukuba, 305-0801, Japan

    M. Arai & T. Yokoo

  5. Institute for Materials Research, Tohoku University, Sendai, 980, Japan

    Y. Endoh

  6. Superconductivity Research Laboratory, International Superconductivity Technology Center, Tokyo, 135-0062, Japan

    S. Tajima

  7. Rutherford Appleton Laboratory, Didcot, Oxon, OX11 0QX, UK

    C. Frost

  8. Department of Materials Science, University of Washington, Seattle, Washington, 98195

    F. Dogan

Authors
  1. J.-H. Chung
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  2. T. Egami
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  3. R. J. McQueeney
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  4. M. Yethiraj
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  5. M. Arai
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  6. T. Yokoo
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  7. H. A. Mook
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  8. Y. Endoh
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  9. S. Tajima
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  10. C. Frost
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  11. F. Dogan
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Chung, JH., Egami, T., McQueeney, R.J. et al. Phonon Dispersion Measurements of YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy. Journal of Superconductivity 15, 327–330 (2002). https://doi.org/10.1023/A:1021057810930

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  • DOI: https://doi.org/10.1023/A:1021057810930

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