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Ultrasonic Study of Intermediate-Valent Intermetallic YbAl2 at Different Physical Conditions

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A simple interaction-potential model has been established to calculate the higher order elastic constants of intermetallic YbAl2 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, Grüneisen numbers, Acoustic-coupling constants, and thermal relaxation time at the different temperatures. Temperature dependency of the ultrasonic properties of YbAl2 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.

Affiliations: 1: Department of Applied Physics, AMITY School of Engineering & Technology, Bijwasan, New Delhi-110 061;, Email:; 2: Department of Physics, Allahabad University, Allahabad-211002, India


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