Low-q dispersion of transverse acoustic phonons in YBa₂Cu₃O_7-δ

2004/11/04 by Andrea Gauzzi, Matteo D'Astuto, Gauzzi, Andrea +7
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.cond-mat/0411120

arxiv created 2004/11/04 · arxiv updated 2009/12/01

Abstract

High-resolution (ΔE=1.3 meV) inelastic X-ray scattering (IXS) in optimally doped untwinned YBa₂Cu₃O_7-δ single crystals show that the dispersion of transverse acoustic phonons in the a-direction remains linear with no softening due to bending modes in the long wavelength limit, down to q=0.02. The sound velocity is found to be 2700 +/- 70 m s^-1, in excellent agreement with ultrasound measurements, and unchanged upon cooling from room temperature to 98 K. These results rule out a strong coupling between bending dynamics of the CuO₂ planes and charge carriers in cuprates.

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