Abstract
Abstract For longitudinal as well as transverse waves, a frequency independent ultrasonic attenuation anomaly was observed at temperature close to the superconducting transition temperature T c (103K) of a polycrystalline TlCaBaCuO. Temperature derivative of shear wave velocity at 10 MHz shows a discontinuity around T c . These variations of attenuation and velocity near T c may be intrinsic to high temperature superconductors.
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