Abstract
The magnetic properties of Na 3RuO 4 have been studied using 99Ru Mössbauer spectroscopy. Magnetic hyperfine splitting is seen at temperatures below 30°K. The value of the flux density at 4.2°K (58.58 T) is compatible with a saturation field at an S = 3 2 Ru V ion, and at intermediate temperatures approximately follows an S = 3 2 Brillouin function. The published interpretation of magnetic susceptibility data in terms of tetranuclear intracluster antiferromagnetism is shown to be incorrect, and it is concluded that Na 3RuO 4 shows antiferromagnetic three-dimensional long-range order with a Néel temperature of T N = 30 ± 1°K. Between 25 and 30°K motional narrowing of the spectrum is seen, which is probably due to a slow spin-spin relaxation within the crystal-field levels of the 4 A 2 g ground state of the Ru V ion. This is the first observation of relaxation effects in a 99Ru spectrum.
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