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.
KeywordsSine Strontium Lanthanum
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- M. F. Hundley,R. S.Kwok, S. W.Cheong,J. D.Thompson and Z. Fisk, Physica C, 172, 455Google Scholar