Abstract
Parallel pumping experiment has been done in the field-induced paramagnetic phase of the antiferromagnet (C 2 H 5 NH 3 ) 2 CuCl 4 at a pumping frequency of 8.9 GHz. Temperature dependence of the spin-wave linewidth Δ H k at the Brillouin-zone-boundary is empirically described as Δ H k =0.1× T 2 Oe in the temperature range from 1.2 to 2.7 K. Wave number dependence of Δ H k is reported as well. Four-magnon relaxation process is appropriate to explain the experimental results.
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