Ultrasonic nonlinearity parameters and third-order elastic constants of germanium between 300 and 77 °K
- 15 January 1974
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 9 (2), 510-516
- https://doi.org/10.1103/physrevb.9.510
Abstract
The ultrasonic-harmonic-generation technique has been used to determine the nonlinearity parameters of germanium between 300 and 77 °K. These results have been combined with pressure-derivative results to isolate a complete set of third-order elastic constants at room temperature. Comparison of these data with predictions of simplified models reveals that a central-force-nearest-neighbor model is less accurate for germanium than for copper. The discrepancy appears to increase as the temperature is lowered.Keywords
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