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|Title: ||Magnetism and magnetic structures of PrMn2Ge2−xSix|
|Authors: ||Wang, JL|
Din, MF MD
|Keywords: ||MAGNETIC PROPERTIES|
|Issue Date: ||1-Nov-2015|
|Abstract: ||The structural and magnetic properties of seven PrMn2Ge2xSix compounds with Si
concentrations in the range x D 0:0–2.0 have been investigated by x-ray diffraction, magnetic (5–350 K), differential scanning calorimetry (300–500 K) and neutron diffraction (3–480 K) measurements. Replacement of Ge by Si leads to a contraction of the unit cell and significant
modifications to the magnetic states—a crossover from ferromagnetism at room temperature for Ge-rich compounds to antiferromagnetism for Si-rich compounds. The compositional dependence of the room temperature lattice parameters exhibits non-linear behaviour around x D 1:2, reflecting the presence of magnetovolume effects. Re-entrant ferromagnetism has been observed in both PrMn2Ge1:0Si1:0 and PrMn2Ge0:8Si1:2 compounds with co-existence of canted ferromagnetism and canted antiferromagnetism detected, with both compounds exhibiting a larger unit cell volume in the canted Fmc state than in the canted AFmc. Combined with earlier studies of this system, the magnetic phase diagram has been constructed over the full range of PrMn2Ge2xSix compositions (x D 0:0–2.0) and over the temperature range of interest (T D 3–480 K). In common with other systems in the RMn2X2 series, the overall magnetic behaviour of PrMn2Ge2xSix compounds is governed by the strong dependence of the magnetic couplings on the Mn–Mn spacing within the ab-plane.
Both total manganese moment Mn tot and in-plane manganese moment Mn
ab at 5 K are found to decrease with increasing Si content, which can be ascribed to the reduction of Mn–Mn separation distance and stronger Si–Mn hybridization compared with Ge–Mn hybridization. Pr site ferromagnetic ordering occurs for x < 1:6 below TPrC . © 2013, IOP Publishing Ltd.|
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