Abstract
Microwave absorption studies on terbium orthoaluminate show a peak which appears, whn the rf field is applied in some preferred direction, at a temperature which depends on the applied frequency (e.g., at 130°K for ν = 17575 MHz) but is independent of the d.c. field up to 8 koe. The absorption peak is explicable in terms of a non-resonant process which involves a strong spin-phonon interaction for the transfer of energy from the spin to the phonons. These results in the high frequency regime are new and re-emphasize the importance of the non-resonant method of studying spin-lattice relaxation processes in some paramagnetic systems.
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