TY - JOUR
T1 - Instability of magnons in two-dimensional antiferromagnets at high magnetic fields
AU - Masuda, T.
AU - Kitaoka, S.
AU - Takamizawa, S.
AU - Metoki, N.
AU - Kaneko, K.
AU - Rule, K. C.
AU - Kiefer, K.
AU - Manaka, H.
AU - Nojiri, H.
PY - 2010/3/2
Y1 - 2010/3/2
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.81.100402
DO - 10.1103/PhysRevB.81.100402
M3 - Article
AN - SCOPUS:77954939872
SN - 1098-0121
VL - 81
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 10
M1 - 100402
ER -