Frequency and temperature dependence of dielectric and ultrasonic dispersion in amorphous materials at low temperatures
Abstract
Changes in ultrasonic velocity and dielectric constant with temperature and frequency in amorphous materials can be explained using the tunneling-states model in the temperature range 0.01 to 20 K, but it is necessary to include explicitly an energy-dependent density of states and a distribution of relaxation times for each tunneling-state energy.
- Publication:
-
Physical Review B
- Pub Date:
- July 1979
- DOI:
- 10.1103/PhysRevB.20.763
- Bibcode:
- 1979PhRvB..20..763A