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VOLUME 60 (1994) | ISSUE 6 | PAGE 446
Observation of nonequilibrium Bose condensation of quasiphonons excited by a noisy microwave pump
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.