μ + Knight shift and spin relaxation in indium single crystalKnight shift and spin relaxation in indium single crystal |
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Authors: | F. N. Gygax P. Birrer B. Hitti E. Lippelt A. Schenck M. Weber |
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Affiliation: | (1) Institut für Mittelenergiephysik der ETH Zürich, CH-5232 Villigen PSI, Switzerland |
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Abstract: | μ + SR measurements have been performed in a single crystal indium sample between 12 K and 300 K with a stroboscopic μSR spectrometer. The muonic Knight shiftK μ and the muonic depolarization rate σ were obtained for various angles θ between the tetragonal crystallinec-axis and the direction of the external field. The isotropic part ofK μ is only weakly temperature dependent and is consistent with the estimated Pauli spin susceptibility value. At a temperature of 12 K the angular dependence ofM 2 (the second moment of the field distribution at the muon, obtained from the measured σ(θ) values) allows a clear determination of the muon location — the symmetric tetrahedral site. The observed anisotropicK μ cannot be explained by the dipoles at the In atoms responsible for the bulk magnetic susceptibility but probably originates from an anisotropic Pauli spin susceptibility. |
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