Abstract
The longitudinal elastic constants of single crystals were measured in the and directions near by an ultrasonic CW resonance technique in the MHz region. The comparison with previous low-frequency (f = 1 Hz) elastic measurements yields a huge acoustic phonon dispersion near . We show that the dispersion is due to the crossover from isothermal to adiabatic behaviour.
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Schedule a callMore From: Journal of physics. Condensed matter : an Institute of Physics journal
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