Spin wave dispersion just above the magnetic order-order transition in the metallic antiferromagnet Mn3Pt

International Workshop on Itinerant-Electron Magnetism

Ibuka, Soshi^1 ; Yokoo, Tetsuya^1 ; Itoh, Shinichi^1 ; Kamazawa, Kazuya^2 ; Nakamura, Mitsutaka^3 ; Imai, Motoharu^4

Institute of Materials Structure Science, High Energy Accelerator Research Organization, Ibaraki Tokai

319-1106, Japan^1

Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society, Ibaraki Tokai

319-1106, Japan^2

Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Ibaraki, Tokai

319-1195, Japan^3

National Institute for Materials Science, Ibaraki Tsukuba, 305-0047, Japan^4

关键词: Antiferromagnets;    Increasing temperatures;    Inelastic neutrons;    Magnetic orders;    Measurement accuracy;    Order-order transitions;    Stiffness constants;    Wave dispersion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/868/1/012017/pdf
DOI  :  10.1088/1742-6596/868/1/012017

来源: IOP

【 摘 要 】

Spin wave dispersion of the metallic antiferromagnet Mn3Pt 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. The dispersion was described by (hω)2= c2q2+ δ2with c = 190 meVÅ and Δ = 3.3 meV. Compared with the previous reports, the result shows that large reduction of the stiffness constant with increasing temperature. This feature is similar to that in FePt3, and will be an indication of the itinerancy of the magnetic moments.