Experimental Generation and Observation of Intrinsic Localized Spin Wave Modes in an Antiferromagnet

Abstract

By driving with a microwave pulse the lowest frequency antiferromagnetic resonance of the quasi 1-D biaxial antiferromagnet (C_2 H_5 NH_3)_2 CuCl_4 into an unstable region intrinsic localized spin waves have been generated and detected in the spin wave gap. These findings are consistent with the prediction that nonlinearity plus lattice discreteness can lead to localized excitations with dimensions comparable to the lattice constant.

10 pages, 4 figures, accepted for publication in Physical Review Letters

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