Anisotropic ultraviolet Raman resonance in underdoped YBa2Cu3O6.7

S. Bahrs, S. Müller, M. Rübhausen, B. Schulz, A. R. Goñi, G. Nieva, and C. Thomsen
Phys. Rev. B 74, 024519 – Published 24 July 2006

Abstract

We report an inverse Raman-bleaching anomaly of oxygen-vacancy-activated phonons in underdoped YBa2Cu3O6.7 excited in resonance at 4.1eV. These modes are closely related to modes that photobleach under visible excitation. The resonance and selection rules match the prediction from the ab in-plane anisotropy of the dielectric function, as does their growth of intensity under illumination. These properties support the oxygen-vacancy-reordering model for photoinduced changes in underdoped YBa2Cu3O7δ. We suggest that a similar coupling to anisotropic electronic resonances is responsible for the recently discovered ab anisotropies in the phonon dispersion.

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  • Received 27 September 2005

DOI:https://doi.org/10.1103/PhysRevB.74.024519

©2006 American Physical Society

Authors & Affiliations

S. Bahrs1, S. Müller2, M. Rübhausen2, B. Schulz2, A. R. Goñi3, G. Nieva4, and C. Thomsen1

  • 1Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
  • 2Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany
  • 3Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Spain
  • 4Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, 8400 San Carlos de Bariloche, Río Negro, Argentina

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Vol. 74, Iss. 2 — 1 July 2006

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