Abstract
Muon spin rotation measurements of the temperature dependence and the anisotropy of the µ+ Knight shift in single crystals of the crystal electric field singlet ground state system PrNi5 reveal pronounced deviations from a linear scaling of the Knight shift with the bulk magnetic susceptibility atT≤50 K. They are explained by a µ+ induced modification of the atomic susceptibility of neighboring Pr3+ ions. From the Knight shift anisotropy atT> 50 K it is determined that the implanted μ+ occupy a single intersitial site, namely the 6i site (0.5, 0, 0.21±0.02). Using this site information, good model fits to the measured data are obtained assuming a μ+ induced perturbation of the crystal electric field at the Pr3+ ions next to the µ+. Apparently, the presence of the µ+ leads to a lowering of the local symmetry, causing a lifting of the degeneracy and a pronounced rearrangement of the low lying crystal electric field levels for these ions.
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Feyerherm, R., Amato, A., Grayevsky, A. et al. Crystal electric field next to a hydrogen-like interstitial— µ+ in PrNi5 . Z. Phys. B - Condensed Matter 99, 3–13 (1995). https://doi.org/10.1007/s002570050002
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DOI: https://doi.org/10.1007/s002570050002