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Magnetic structure and magnetocalorics of GdPO4

AuthorsPalacios, Elias; Rodríguez-Velamazán, J. A.; Evangelisti, Marco; McIntyre, G. J.; Lorusso, Giulia; Visser, D.; Jongh, L. J. de; Boatner, L. A.
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review B 90: 214423 (2014)
AbstractThe magnetic ordering structure of GdPO4 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 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 ΔB=0-7T, reaches -ΔST=375.8mJ/cm3K-1 at T=2.1 K, largely exceeding the maximum values reported to date for Gd-based magnetic refrigerants.
DescriptionUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.90.214423
Identifiersdoi: 10.1103/PhysRevB.90.214423
issn: 1098-0121
e-issn: 1550-235X
Appears in Collections:(ICMA) Artículos
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