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Instability of magnons in two-dimensional antiferromagnets at high magnetic fields

Masuda, Takatsugu*; Kitaoka, Shuji*; Takamizawa, Satoshi*; Metoki, Naoto  ; Kaneko, Koji  ; Rule, K. C.*; Kiefer, K.*; Manaka, Hiroshi*; Nojiri, Hiroyuki*

Spin dynamics of the square lattice Heisenberg antiferromagnet, Ba$$_2$$MnGe$$_2$$O$$_7$$, is studied by a combination of bulk measurements, neutron diffraction, and inelastic neutron-scattering techniques. Easy plane type antiferromagnetic order is identified at T$$leq$$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 $$H$$$$_{rm C}$$ 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 0.7$$H$$$$_{rm C}$$ $$_sim^{<}$$ $$H$$ $$_sim^{<}$$ 0.85$$H$$$$_{rm C}$$.

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Category:Materials Science, Multidisciplinary

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