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• W1993417886 abstract "We demonstrate that local modulations of magnetic couplings have a profound effect on the temperature dependence of the relaxation rate of optical magnons in a wide class of antiferromagnets in which gapped excitations coexist with acoustic spin waves. In a two-dimensional collinear antiferromagnet with an easy-plane anisotropy, the disorder-induced relaxation rate of the gapped mode, Gamma_imp=Gamma_0+A(TlnT)^2, greatly exceeds the magnon-magnon damping, Gamma_m-m=BT^5, negligible at low temperatures. We measure the lifetime of gapped magnons in a prototype XY antiferromagnet BaNi2(PO4)2 using a high-resolution neutron-resonance spin-echo technique and find experimental data in close accord with the theoretical prediction. Similarly strong effects of disorder in the three-dimensional case and in noncollinear antiferromagnets are discussed." @default.
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• W1993417886 date "2012-08-27" @default.
• W1993417886 modified "2023-09-26" @default.
• W1993417886 title "Lifetime of Gapped Excitations in a Collinear Quantum Antiferromagnet" @default.
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• W1993417886 doi "https://doi.org/10.1103/physrevlett.109.097201" @default.
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