Abstract
We present zero-field muon spin relaxation(μ+SR) measurements on the rare earth antiferromagnetPrO2. Oscillations in the time dependence of the muon polarization, characteristicof a quasistatic magnetic field at two distinct muon sites, are observed belowTN, along with relaxation dominated by the magnitude of the local field. Candidate muon sites inthe material are suggested on the strength of dipole field calculations. Relaxation aboveTN allows a prediction of the quasielastic neutron scattering linewidth, which is discussed in termsof a simple model of magnetoelastic relaxation involving a crystal field state at an energyΔ above the ground level. The obtained value ofΔ may be taken as an approximate estimate of the splitting of theΓ8 groundstate of Pr4+ in the distorted fluorite structure.
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