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We have measured the temperature dependence of the velocity of 10-MHz ultrasonic pulses which were propagated along the layers of the dichalcogenides 2 H -Ta S 2 , 1 T -Ta S 2 , and 2 H -Nb Se 2 . In 2 H -Ta S 2 the plate mode velocity shows little temperature dependence above the charge-density-wave onset temperature of about 78 K, but shows an increased stiffening below it. In 1 T -Ta S 2 the charge-density wave becomes commensurate near 170 K and the velocity undergoes a steplike stiffening, while the sound attenuation displays a large peak at this temperature. Both velocity and attenuation show strong hysteresis near this transition. Attention is drawn to the similarity between the velocity anomalies and corresponding anomalies in the magnetic susceptibility. It is suggested that the elastic anomalies might be caused by the d -band electrons. Band deformation potentials of the order of 1 eV and estimates of anharmonic background contributions to the velocity are obtained.
Physical Review B – American Physical Society (APS)
Published: Nov 15, 1980
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