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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Institution: | (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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