doi:10.1103/PhysRevB.90.214423engPalacios, E.Rodriguez-Velamazan, J.A.Evangelisti, M.McIntyre, G.J.Lorusso, G.Visser, D.de Jongh, L.J.Boatner, L.A.Magnetic structure and magnetocalorics of GdPO4ART-2014-97200The magnetic ordering structure of GdPO4 is determined at T=60 mK by the diffraction of hot neutrons with wavelength ¿=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 TN=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 ¿B=0-7T, reaches -¿ST=375.8mJ/cm3K-1 at T=2.1 K, largely exceeding the maximum values reported to date for Gd-based magnetic refrigerants.2014http://zaguan.unizar.es/record/7102010.1103/PhysRevB.90.214423http://zaguan.unizar.es/record/71020oai:zaguan.unizar.es:71020info:eu-repo/grantAgreement/ES/MINECO/MAT2012-38318-C03-01info:eu-repo/grantAgreement/ES/MINECO/MAT2013-44063-RPhysical Review B. Condensed Matter and Materials Physics 90, 21 (2014), 214423 [9 pp]by-nchttp://creativecommons.org/licenses/by-nc/3.0/es/info:eu-repo/semantics/openAccess