Ultrasonic Study of Three La2−ySryCuO4+x Crystals
We present the results of an ultrasonic study of three monocrystals of La2−ySryCuO4+x.. Longitudinal and transverse waves have been used along a or c direction at 30 and 90 MHz. For each sample four contributions reproduce the experimental data. The main one is the phonon-phonon interaction, two relaxations are identified and the tetragonal to orthorhombic transition gives an additional critical variation satisfying well defined selection rules.
KeywordsTransverse Wave Sound Velocity High Frequency Signal Neel Temperature Ultrasonic Study
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- M. F. Hundley,R. S.Kwok, S. W.Cheong,J. D.Thompson and Z. Fisk, Physica C, 172, 455Google Scholar