Observation of nonequilibrium Bose condensation of quasiphonons excited by a noisy microwave pump
Andrienko A. V., Safonov V. L.
The parametric excitation of quasiphonons in the antiferromagnet FeB03 by a noisy microwave field has been studied. There are two critical pump amplitudes: one corresponding to the onset of nonlinear absorption of microwave power and one above which strong phase correlations, i.e., a nonequilibrium Bose condensate, arise in the system of excited quasiphonons. © 7994 American Institute of Physics.