Abstract
Positive-muon spin rotation (μ +SR) has been carried out in a single crystal of the hexagonal antiferromagnet UNi 4B, for which the magnetic structure has recently been resolved by Mentink et al. No spontaneous precession was observed in zero field with the μ + spin directed along the rhombohedral b-axis; instead, rapidly and slowly relaxing components (comprising 70% and 30% volume fraction, respectively) were found. On the other hand, a frequency of 5 MHz was detected when the μ + spin was directed along the c-axis. Transverse-field measurements indicate that the μ + is not stopped at a highly symmetric site. The experimental results are compared with calculations based on the magnetic structure.
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