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

T. Masuda, S. Kitaoka, S. Takamizawa, N. Metoki, K. Kaneko, K. C. Rule, K. Kiefer, H. Manaka, H. Nojiri

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


Spin dynamics of the square lattice Heisenberg antiferromagnet, Ba 2 MnGe2 O7, is studied by a combination of bulk measurements, neutron diffraction, and inelastic neutron-scattering techniques. Easy plane type antiferromagnetic order is identified at T≤4.0K. The exchange interactions are estimated as J1 =27.8 (3)μeV and J 2 =1.0 (1) μeV, and the saturation field HC 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 HC 7Hc≤H≤0.85HC.

Original languageEnglish
Article number100402
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
Publication statusPublished - 2010 Mar 2


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