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Electric field gradients probed by μ+SR in Sc and \alpha\mbox-ScH_x solid solutions

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Abstract

In Sc and \alpha\mbox-ScH_x below 40 K two μ+ states are formed: a tunnelling state extending over two adjacent tetrahedral (T) interstices sharing one face in the ab‐plane of the hcp host lattice and a static μ+–Sc–H configuration analog to the T‐pair state formed by two H atoms across a Sc site along the crystalline c‐axis. This explains perfectly the high transverse‐field (TF) μSR measurements at low temperature and allows a qualitative understanding of the temperature dependence.

The modelling of the low TF measurements requires in addition the consideration of the electric field gradient (EFG) components acting on the Sc nuclei near the μ+, i.e., of the radial EFG due to the μ+ and of the axially symmetric crystal field. The magnetic field dependence of the anisotropic μ+SR relaxation rate is strongly influenced by the H‐concentration in the solid solution system.

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References

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Authors and Affiliations

  1. Institute for Particle Physics, ETH Zürich, CH‐5232, Villigen PSI, Switzerland

    F.N. Gygax, A. Amato, M. Pinkpank & A. Schenck

  2. Institut Laue Langevin, B.P.156, F‐38042, Grenoble Cedex 9, France

    I.S. Anderson

  3. Paul Scherrer Institut (PSI), CH‐5232, Villigen PSI, Switzerland

    G. Solt

  4. Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA

    T.J. Udovic

Authors
  1. F.N. Gygax
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  2. A. Amato
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  3. M. Pinkpank
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  4. A. Schenck
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  5. I.S. Anderson
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  6. G. Solt
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  7. T.J. Udovic
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Gygax, F., Amato, A., Pinkpank, M. et al. Electric field gradients probed by μ+SR in Sc and \alpha\mbox-ScH_x solid solutions. Hyperfine Interactions 106, 91–95 (1997). https://doi.org/10.1023/A:1012621303782

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  • DOI: https://doi.org/10.1023/A:1012621303782

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