Neutron diffraction study of Lu2Fe17 under high pressure

Effect of uniaxial pressure on helimagnetic structure in Lu2Fe17

“…Data are presented in table 1. Thermal expansion and compressibility of Lu 2 Fe 17 were measured by both, the micro-strain gauges under hydrostatic pressures up to 1 GPa and by the neutron diffraction method [7,14] at 300K and κ a = 4.1x10 -3 GPa -1 , κ c = 7.5x10 -3 GPa -1 at 5K, well agree with values of κ a and κ c at temperature 300 K presented in [15].…”

“…The ferromagnetic ground state is totally suppressed in Lu 2 Fe 17 and Y 2 Fe 17 intermentallics by hydrostatic pressures above 0.3 GPa and 0.8 GPa, respectively [6][7][8]. The pressure induced IHS that is described by a propagation vector (00t z ) [3,7], is however, closely related to the original ferromagnetic structure and underlining hexagonal crystal structure of these intermetallics that is shown in figure 1.…”

“…The pressure induced IHS that is described by a propagation vector (00t z ) [3,7], is however, closely related to the original ferromagnetic structure and underlining hexagonal crystal structure of these intermetallics that is shown in figure 1. The ferromagnetic arrangement remains preserved in the basal ab-planes (easy magnetization plane), but, magnetization of the planes rotates as one moves along the crystal c-axis (that is the hard magnetization direction).…”

Magnetization and specific heat study of metamagnetism in Lu2Fe17-based intermetallic compounds

“…Competition of positive and negative exchange interactions between the Fe atoms at four non-equivalent crystallographic sites (4f, 6g, 12j, 12k) of the hexagonal crystal structure of the Th 2 Ni 17 type [1] results in appearance of two types of magnetic ordering when increasing the temperature: ferromagnetic (F) phase up to the Curie temperature T C ¼ 130 K and the non-collinear antiferromagnetic (AF) (helimagnetic) phase up to the Néel temperature T N ¼ 274 K [2]. The presence of dumbbell-like pairs of Fe atoms in 4f positions with the shortest interatomic distances of w2.4 Å and the strongest negative exchange interactions between the atoms located along the c axis is a special feature of R 2 Fe 17 rare-earth compounds [3].…”

Magnetism of a Lu2Fe17H Single Crystal under Pressure

“…1,2) A significant change of magnetic properties of Lu 2 Fe 17 is observed under hydrostatic pressure [3][4][5] as well as due to interstitial solution of atoms of light elements. 6,7) In this paper we studied changes in magnetic properties due to the lattice expansion of Lu 2 Fe 17 produced by the hydrogenation up to Lu 2 Fe 17 H composition and due to successive shrinkage of the lattice by application of external pressure.…”