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24 April 2024

» arxiv » 1002.2470

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Instability of Magnons in Two-dimensional Antiferromagnet at High Magnetic Fields
T. Masuda ; S. Kitaoka ; S. Takamizawa ; N. Metoki ; K. Kaneko ; K.C. Rule ; K. Kiefer ; H. Manaka ; H. Nojiri ;
Date:	12 Feb 2010
Abstract:	Spin dynamics of the square lattice Heisenberg antiferromagnet, BaMnGeO, is studied by a combination of bulk measurements, neutron diffraction, and inelastic neutron scattering techniques. Easy plane type antiferromagnetic order is identified at $T le 4.0$ K. The exchange interactions are estimated as $J_1$ = 27.8(3)${mu}$eV and $J_2$ = 1.0(1) ${mu}$eV, and the saturation field $H_{ m C}$ is 9.75 T. Magnetic excitation measurements with high experimental resolution setup by triple axis neutron spectrometer reveals the instability of one magnon excitation in the field range of $0.7H_{ m C} lesssim H lesssim 0.85H_{ m C}$.
Source:	arXiv, 1002.2470
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