Abstract
A simple interaction-potential model has been established to calculate the higher order elastic constants of intermetallic YbAl 2 in the temperature range from 10-300K. Temperature dependent second and third order elastic constants are used for the determination of the ultrasonic attenuation, velocity, Gruneisen numbers, Acoustic-coupling constants, and thermal relaxation time at the different temperatures. Temperature dependency of the ultrasonic properties of YbAl 2 is similar at low temperatures to that of pure metals and the low carrier heavy fermion systems- LaSb, YbAs and YbP having simple NaCl-type structures. Thermal energy density makes significant contribution to the total attenuation in the compound at the higher temperatures from 100-300K. Effect of the magnetic field on the ultrasonic attenuation is also evaluated using the magneto resistance data. At 100K, the effect of the magnetic field becomes insignificant. The attenuation decreases with the field at 3K to 50K.
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