Spin wave dispersion just above the magnetic order-order transition in the metallic antiferromagnet Mn$_3$Pt
| Autor: | Ibuka, Soshi, Yokoo, Tetsuya, Itoh, Shinichi, Kamazawa, Kazuya, Nakamura, Mitsutaka, Imai, Motoharu |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | J. Phys.: Conf. Ser. 868 (2017) 012017 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1742-6596/868/1/012017 |
| Popis: | Spin wave dispersion in 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. The dispersion was described by $({\hbar\omega})^2 = c^2q^2 + \Delta^2$ with $c = 190$ meV {\AA} and $\Delta = 3.3$ meV. Compared with the dispersion at $T = 419$ K previously reported, the result demonstrates a large reduction of the stiffness constant $c$ with increasing temperature. This is similar to that observed in the metallic antiferromagnet FePt$_3$, and is an indication of the itinerancy of the magnetic moments. Comment: 7 pages, 3 figures, International Workshop on Itinerant-Electron Magnetism, 2015/9/25-27, Kyoto, Japan |
| Databáze: | arXiv |
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