Further Studies of the Enhanced Nuclear Magnet HoVO_4 III. The Non-Resonant Magnetoacoustic Absorption
In an earlier paper Bleaney et al. (Proc. R. Soc. Lond. A 389, 479 (1983)) have used acoustic waves at frequencies of order 800 MHz to study the enhanced nuclear resonant absorption of 165Ho (I = 7/2) in the tetragonal Van Vleck magnet HoVO_4. They observed also a large non-resonant absorption, that vanished on the application of a magnetic field or reduction of the temperature to below 2 K. The variation of this non-resonant absorption with frequency, magnetic field and temperature is reported in this paper, and shown to agree with theory. Measurements have been made on single crystals both of HoVO_4, and of (0.1 Ho, 0.9Y) VO_4. The generation and detection of such acoustic waves, together with measurements of their velocities, have been described in paper II of this series.
Proceedings of the Royal Society of London Series A
- Pub Date:
- March 1988