Abstract
Abstract The velocity and attenuation vs temperature of ultrasonic longitudinal wave propagated along two directions in the c-plane at 10° to the a and b axes were measured for a Bi2Sr2CA1Cu2O8 single crystal. The anisotropic elasticity in the c-plane is manifested. One direction shows obvious softening minimum around 250 K, the other reveals only monotonic stiffening down to Tc. The origin of the overall trend of elastic stiffening and some discrepancies appearing in the measurements so far for high Tc materials are analyzed or clarified. Attenuation peaks at 95K, 150K, and 250K are attributed to phase-like transition of first order.
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