| Autor: |
Platkov, V. Ya., Polunina, L. N., Startsev, V. I. |
| Zdroj: |
Journal of Low Temperature Physics; February 1973, Vol. 10 Issue: 3-4 p359-367, 9p |
| Abstrakt: |
This paper presents the results of the dislocation amlitude-dependent ultrasonic attenuation studies in normal and superconducting indium. The measurements were taken by the pulse method with longitudinal oscillations of 7.5 Mcs/sec. Amplitude-dependent attenuation is represented by a saturation curve. Amplitude-dependent attenuation measured at fixed amplitude in the superconducting state grows with a decreasing temperature in the range 3.4 to 1.8 K and then drops below 1.8 K. In the normal state it does not show any temperature variation. The results indicate that the condition of dislocation unpinning are more favorable in the superconducting state than in the normal and that electronic damping factor does not depend on temperature in the normal state. It is in fair agreement with the theories of electronic drag of dislocation developed by Kravchenko and Holstein. |
| Databáze: |
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| Externí odkaz: |
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