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Raman study of twin-free ortho-II YBa2Cu3O6.5 single crystals

M. N. Iliev and V. G. Hadjiev

S. Jandl and D. Le Boeuf

V. N. Popov

D. Bonn, R. Liang, and W. N. Hardy

  • Texas Center for Superconductivity, University of Houston, Texas 77204-5002, USA

  • Regroupement Québecois sur les Matériaux de Pointe, Département de Physique, Université de Sherbrooke, Sherbrooke, Canada J1K 2R1

  • Faculty of Physics, University of Sofia, 1164 Sofia, Bulgaria

  • Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

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Phys. Rev. B 77, 174302 – Published 19 May, 2008

DOI: https://doi.org/10.1103/PhysRevB.77.174302

Abstract

The polarized Raman scattering spectra from freshly cleaved ab, ac, and bc surfaces of high quality twin-free YBa2Cu3O6.5 (ortho-II) single crystals (Tc=57.5 K and ΔT=0.6 K) were studied between 80 and 300 K. All 11 Ag Raman modes expected for the ortho-II structure as well as some modes of B2g and B3g symmetries were identified in close comparison to predictions of lattice dynamical calculations. The electronic scattering from the ab planes is strongly anisotropic and decreases between 200 and 100 K within the temperature range of a previously reported pseudogap opening. The coupling of phonons to Raman active electronic excitations manifested by asymmetric (Fano) profiles of several modes also decreases within the same range. Among the findings that distinguish the Raman scattering of the ortho-II phase from that of the ortho-I phase is the unusual relationship (αxx≈−αyy) between the elements of the Raman tensor of the apex oxygen Ag mode.

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Phys. Rev. B 77, 174302– Published 19 May, 2008
  • Received 20 February 2008

© 2008 American Physical Society

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