Abstract
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 (ħω)2 = c2q2 + δ2 with 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.
Highlights
The recent discovery of iron-based superconductors [1] has renewed interest in a basic understanding of the dynamical magnetic properties of metallic antiferromagnets
In metallic antiferromagnets with 4d or 5d electrons like FePt3 [2], the spin dynamics are expected to show the intermediate character between itinerant electron magnets, such as Cr and γ-FeMn, and localized spin magnets, such as Heusler alloys, because of the high polarizability of 4d and 5d electrons [3]
The spin wave dispersion was investigated by using high-energy incident neutrons
Summary
The recent discovery of iron-based superconductors [1] has renewed interest in a basic understanding of the dynamical magnetic properties of metallic antiferromagnets. The understanding of the spin dynamics in these magnets is still incomplete. The aim of this study is to examine the itinerancy and the locality of the magnetic moments in one of these alloys, Mn3Pt. Mn3Pt is a Cu3Au-type metallic antiferromagnet with the transition temperature TN = 475 K [4, 5]. Mn3Pt is a Cu3Au-type metallic antiferromagnet with the transition temperature TN = 475 K [4, 5] It shows magnetic order-order transition at Tt = 400 K. In the low temperature phase, which is called D-phase, Mn moments form a triangular spin structure with the moments lying in the 111 plane.
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