| Autor: |
Natale, Giovan G., Wang, Taylor G. J., Stern, Richard, Rudnick, Isadore |
| Zdroj: |
Journal of the Acoustical Society of America; 1966, Vol. 40 Issue 5, p1261-1261, 1p |
| Abstrakt: |
Measurements of ultrasonic absorption have been made in potassium as a function of temperature from 2.5° to 77°K at various frequencies between 200 and 400 kcps. The samples are polycrystalline wires in which Young-modulus-type waves are propagated and the attenuation is measured using a standard pulse-echo or a resonance-decay technique. The results show the presence of a large component of attenuation, presumably due to dislocation motion, which has a broad amplitude maximum in the region between 25° and 40°K. At temperatures below 20°K, the attenuation due to electron-lattice interaction becomes dominant and its main features (amplitude, temperature, and frequency dependence) are discussed in relation to the values predicted by the free-electron theories. [Work supported by the U. S. Office of Naval Research.] [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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