Abstract
The Mn ions occupy three different sites (8i, 8j, 8f ) in equal population in YMn 12, which has the tetragonal ThMn 12 structure with space group I4/mmm. They possess a different magnetic moment at the 8f site (0.14 μ B) compared to the 8i and 8j sites (0.42 μ B). The compound orders antiferromagnetically with T N ≈100 K . Above T N the muon-spin relaxation is dominated by the nuclear dipole fields of 55Mn. The influence of the electronic moments on Mn is only weakly felt near T N when critical slowing down occurs. Below T N, no spontaneous spin precession is observed and the zero-field spectra can be described by a Lorentzian Kubo–Toyabe pattern. This shows that the muon must occupy an interstitial site where all contributions to the local field cancel for the antiferromagnetic spin structure. Longitudinal field measurements demonstrate that the spectra are essentially static in nature. It is remarkable that the different Mn sites with their different Mn moments do not show in the μSR spectra. The likely muon stopping sites are discussed.
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