Physics of the Solid State
Volumes and Issues
Magnetostructural phenomena in hydrides of metastable Laves phases RMn2D3-δ
Makarova O. L.1, Goncharenko I. N.2, Tsvyashchenko A. V.3, Fomicheva L. N.3
1National Research Center “Kurchatov Institute”, Moscow, Russia
2Laboratoire Léon Brillouin, CEA Saclay, France
3Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, Russia

We have studied the processes of atomic and magnetic ordering in the hydrides of the metastable Laves phases RMn2D3-δ (R= Y, Tb, and Dy; δ≤ 0.14) in the temperature range from 2 to 300 K and the pressure range from 0 to 6 GPa by X-ray and neutron diffraction methods. We found that a hydrogen superstructure with symmetry reduction to P63/m is formed in the hydrides RMn2D3-δ near room temperature. A number of unusual magnetic phenomena that have never been observed in the hexagonal Laves hydrides RMn2Dx was found, namely, the coexistence of ferrimagnetic and antiferromagnetic orderings in RMn2D3-δ (R= Tb, Dy) and pressure-induced transition from the ferrimagnetic to antiferromagnetic state in TbMn2D2.86. It has been suggested that the topology of the crystal lattice plays an important role in the formation of the magnetic properties of the hexagonal hydrides RMn2D3-δ. Keywords: rare earth intermetallics, hydrides, magnetostructural transition, neutron diffraction, high pressures.
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