Sound Attenuation in U2D2 Solid Helium-3

Abstract

We calculated the sound attenuation in the U2D2 phase of solid ³He using methods similar to those developed by Khalatnikov et al. ¹ Anisotropy of the crystal is also taken into consideration and the kinetic equation and the Bogtzmann equation are expanded with the strain tensor. We have considered the collision integrals for the scattering of magnons by magnons and the sound attenuation resugting from this process is evaluated. The resugts are compared with the measurements performed by Yamaguchi et al. ²