Abstract
The longitudinal ultrasonic attenuation coefficient for a clean d-wave superconductor has been calculated for the case of a dx2−y2 order parameter and a simple two-dimensional tight-binding Fermi surface. We find that the attenuation coefficient exhibits a linear temperature dependence at low temperatures for all directions of the ultrasound wavevector and, in the nodal direction, a peak in the coefficient as a function of temperature occurs away from half filling.
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