Magnetic order of Mn 5 Si 3 -type Tb 5 Sb 3 and Tb 5 Si 1.5 Sb 1.5

A. V. Morozkin (1) , Olivier Isnard (2)

1 MSU - Lomonosov Moscow State University
2 NEEL - MRS - Matériaux, Rayonnements, Structure

Neutron diffraction study has been performed on the Tb 5Sb 3 and Tb 5Si 1.5Sb 1.5 compounds (hexagonal Mn 5Si 3-type, hP16, P6 3/mcm) to understand their magnetic structures. The temperature dependence of neutron diffraction results proves that these intermetallics show a complex magnetic ordering. The Tb 5Sb 3 presents five subsequent changes in magnetic structure at ˜150, 119, 85, 70 and 54 K on cooling: paramagnet→antiferromagnetic flat spiral→ferromagnetic cone→antiferromagnetically canted ferromagnetic cone→canted AF→sine modulated AF. The Tb 5Si 1.5Sb 1.5 shows two subsequent changes in magnetic structure at 123 and 66 K: paramagnet→sine modulated antiferromagnet I→sine modulated antiferromagnet II. The Tb 5Si 3, Tb 5Sb 3 and Tb 5Si 1.5Sb 1.5 have the different magnetic structure in the full temperature range.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

A. V. Morozkin, Olivier Isnard. Magnetic order of Mn 5 Si 3 -type Tb 5 Sb 3 and Tb 5 Si 1.5 Sb 1.5. Journal of Magnetism and Magnetic Materials, 2011, 323, pp.3189-3197. ⟨10.1016/J.JMMM.2011.07.004⟩. ⟨hal-00984934⟩