Abstract

We have measured the temperature dependence of the peak position and linewidth of the 42.5 meV phonon branch in a twinned single crystal of YBa2Cu3O7 as a function of wave vector q. In the 100/010 direction in the Brillouin zone, considerable softening and broadening occur below the superconducting transition temperature Tc at some values of q. We observe an order of magnitude smaller softening and no linewidth broadening for q in the 110/110 direction. Possible implications of these findings for the symmetry of the superconducting order parameter are discussed.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

319007

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 1995 American Physical Society (APS), All rights reserved.

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