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q-Dependent phonon renormalization: Possible test for the symmetry of the superconducting gap by neutron scattering?

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Abstract

Theq dependence of the phonon renormalization belowT c is studied for superconducting gaps with different symmetries. It is shown that for small to intermediate values ofq the angular dependence of the renormalization is characteristic of the gap anisotropy. However, we demonstrate that this dependence is not solely due to the symmetry of the gap, but also to the specific functional form of Δk. We compare our calculations with recent neutron scattering experiments done on YBa2Cu3O7. These data are well described in terms of ans-wave anisotropic gap resulting from the nontotally screened interaction of holes with long-wave, optical phonons.

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Authors and Affiliations

  1. Lawrence Berkely Lab., 1 Cyclotron Road, MS 62-203, 94720, Berkeley, California

    A. Bill

  2. Institut für Physik, Technische Universität Cottbus, P.O. Box 101344, 03013, Cottbus, Germany

    A. Bill & E. Sigmund

  3. Tartu University, Tähe 4, Tartu, Estonia

    V. Hizhnyakov

Authors
  1. A. Bill
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  2. V. Hizhnyakov
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  3. E. Sigmund
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Additional information

The authors are grateful to A. Furrer, J. Mesot, K. A. Müller, and M. V. Eremin for discussions. A. B. acknowledges financial support from the Swiss National Science Foundation.

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Bill, A., Hizhnyakov, V. & Sigmund, E. q-Dependent phonon renormalization: Possible test for the symmetry of the superconducting gap by neutron scattering?. J Supercond 9, 437–438 (1996). https://doi.org/10.1007/BF00727291

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  • DOI: https://doi.org/10.1007/BF00727291

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