Theory of Ultrasonic Attenuation by Hopping Pairs in n-Ge
It is known that the attenuation of ultrasound in n-Ge at microwave frequencies of the order of few GHz and in the temperature range from about 7 to 40 K is mainly due to the interaction of acoustic phonons with electrons localized on neutral donors [1,2]. Due to this mechanism the attenuation coefficient is strongly anisotropic and vanishes fof longitudinal ultrasonic wave propagating along  and for transverse one with \(\vec q\)ll  and polarisation along .
KeywordsMicrowave Anisotropy Attenuation
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