Abstract
Microwave acoustic phonons generated during a phonon avalanche in a paramagnetic crystal have been detected by means of the optical technique of Brillouin scattering. The avalanche was generated in Ni-doped MgO during the direct paramagnetic relaxation of the ΔM = 1 transitions of Ni 2+. An expression for the minimum detectable avalanche phonon excitation was derived and compared with the observed values for the transverse acoustical modes. The measurements showed a peak avalanche phonon temperature of 10 3 to 10 4 °K.
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