Abstract
We have measured 11B NMR spectra in the hexagonal antiferromagnetic compound UNi 4B (Néel temperature T N = 20 K) over the temperature range 2–260 K. Spectra in the paramagnetic state yield a quadrupole splitting frequency of 0.215 ± 0.016 MHz and temperature-dependent Knight shifts. For applied field in the basal plane a Knight shift versus susceptibility plot yields a total hyperfine field of 1.14 ± 0.15 kOe/ μ B. The observed 11B line below T N in a c-axis field-oriented powder sample exhibits a partial powder pattern due to three magnetically inequivalent boron sites. The width of this line is consistent with the magnetic structure determined by neutron diffraction, using the transferred hyperfine field derived from paramagnetic-state 11B spectra, and therefore confirms the presence of the frustrated U spins.
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