Abstract

The attenuation of ultrasonic waves at moderately high frequencies has been measured in Stycast 1266 in the temperature range from 0.1 to 4.2 K to verify the very low attenuation expected from similar data observed in another epoxy resin. Below about 0.5 K the attenuation data are compatible with a T3 dependence and a frequency independent behavior reminiscent of the standard result predicted by the Two Level System (TLS) theory and observed in amorphous materials. The observed low attenuation in Stycast 1266 confirmed our earlier expectation that this is a good material to use for acoustic microscopy purpose at very low temperatures.

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