Variation of the sublattice magnetisation in antiferromagnetic GdVO4with temperature from the NMR of51V, I=7/2

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Abstract
Gadolinium vanadate (GdVO4) is a tetragonal paramagnet which enters an antiferromagnetic phase below TN=2.4955(5)K, with a simple two-sublattice structure in which the Gd3+ spins are aligned parallel to the tetragonal axis. The authors have studied the 51V (I=7/2) nuclear magnetic resonance between T=0.48K and 1.9K; in zero applied field the seven quadrupole split lines have a width of 0.8 mT and are very intense. The central line lies at a frequency of nearly 12.9 MHz at the lowest temperature, falling to approximately 10.0 MHz at 1.9K, and can be measured to 2 kHz. The frequency can be fitted to the formula nu / nu 0=1-0.2759(T/TN)2-0.1908(T/TN)4... with nu 0=13.03(3) MHz and this is assumed to represent the temperature dependence of the sublattice magnetisation for T<1.9K. The Mossbauer measurements of Cook and Cushion agree closely with their results and extend to the Neel point. A comparison is made with the variation of the sublattice magnetisation as determined by the technique of Hornreich and Shtrikman from measurements of the parallel susceptibility by Cushion et al; the agreement is found to be excellent.