The internal friction (e-'), ultrasonic attenuation ((U) and variation of Young's modulus (AEIE) of YBa2Cu309_, were measured with frequencies of 5 kHz, 120 kHz and 5 MHz. Several Q-' (or (U) peaks and corresponding minima of A E / E were observed.According to x-ray diffraction results, the Q-' peak as well as other anomalies can be attributed to a discontinuous change of lattice parameters. The tendency to elastic softening above 90 K may play an important role in superconductivity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.