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The magnetic ordering structure of GdPO 4 is determined at T= 60 mK by the diffraction of hot neutrons with wavelength λ= 0.4696 Å. It corresponds to a noncollinear antiferromagnetic arrangement of the Gd moments with propagation vector k=(1/2, 0, 1/2). This arrangement is found to minimize the dipole-dipole interaction and the crystal-field anisotropy energy, the magnetic superexchange being much smaller. The intensity of the magnetic reflections decreases with increasing temperature and vanishes at T≈ 0.8 K, in agreement with the magnetic ordering temperature T N= 0.77 K, as reported in previous works based on heat capacity and magnetic susceptibility measurements. The magnetocaloric parameters have been determined from heat capacity data at constant applied fields up to 7 T, as well as from isothermal magnetization data. The magnetocaloric effect, for a field change Δ B= 0− 7 T, reaches− Δ S T …
American Physical Society
Publication date: 
12 Dec 2014

E Palacios, JA Rodríguez-Velamazán, Marco Evangelisti, GJ McIntyre, G Lorusso, Dirk Visser, L Jos de Jongh, Lynn A Boatner

Biblio References: 
Volume: 90 Issue: 21 Pages: 214423
Physical Review B