Dynamic susceptibility measurements on thermally isolated cerium magnesium nitrate show that all lattice oscillators participate in the Orbach spin-lattice relaxation process. The observed environmental influence on the relaxation behaviour when the crystal is in direct contact with liquid helium can be explained with a thermal conduction model.
Overweg, J. A., Flokstra, J., & Gerritsma, G. J. (1980). Spin-lattice relaxation in cerium magnesium nitrate no partial lattice participation observed. Journal of magnetism and magnetic materials, 15-18(Part 2), 739-740. https://doi.org/10.1016/0304-8853(80)90742-8