Phonon-Induced Nuclear Spin-Wave Instabilities in RbMnF3
Abstract
We report the first observations of nonlinear phonon-induced nuclear spin-wave instabilities in an antiferromagnet possessing a nuclear magnetic moment. The observed instabilities are associated with the transverse nuclear mode of cubic RbMnF3. The nuclear relaxation rates are obtained as a function of the magnon frequency and wave number. This observation verifies a recently published prediction by Platzker and Morgenthaler that a sufficiently intense elastic wave of the proper frequency and polarization can indeed drive antiferromagnetic spin waves unstable.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 1971
- DOI:
- 10.1103/PhysRevLett.26.442
- Bibcode:
- 1971PhRvL..26..442P