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Spin wave dispersion just above the magnetic order-order transition in the metallic antiferromagnet Mn$$_{3}$$Pt

Ibuka, Soshi*; Yokoo, Tetsuya*; Ito, Shinichi*; Kamazawa, Kazuya*; Nakamura, Mitsutaka  ; Imai, Motoharu*

Spin wave dispersion of the metallic antiferromagnet Mn$$_{3}$$Pt was investigated just above the order-order transition temperature by using the inelastic neutron scattering technique. The spin wave dispersion at $$T$$ = 400 K along [100], [110] and [111] directions was isotropic within the measurement accuracy. These results show that large reduction of the stiffness constant with increasing temperature, and indicate the itinerancy of the magnetic moments.

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