Abstract
In this presentation, recent works on the pressure and temperature dependence of the sound velocity will be discussed. We have used a newly developed method combining the time‐resolved picosecond optical technique and a diamond anvil cell [1]. This setup makes possible accurate measurements of the attenuation and velocity of longitudinal waves in the Ghz range, and opens the elastic investigations of all materials (opaque, transparent, single‐ or polycrystal, liquids) up to several Mbar and thousands of K. The experimental method will be first described, with a discussion of the factors limiting the possibilities and the technique accuracy. [1] F. Decremps, L. Belliard, B. Perrin, and M. Gauthier, Phys. Rev. Lett, to be pubished in January 2008.
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