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We use transverse field muon spin rotation to probe the low field dynamics of Ho3+ ions imbedded in a single crystal host matrix of CaWO4. The Ho3+ ions at sites with the full tetragonal symmetry of the crystal have avoided level crossings of hyperfine sublevels of the ground crystal-field doublet, resulting in measurable changes in the both the AC susceptibility and transverse field muon depolarization rate. The host material has primarily nonmagnetic nuclear species and no magnetic ions, and so the muon is shown to be a direct nonresonant probe of pronounced changes of relaxation rates of the coupled electron-nuclear excitations of Ho3+ at avoided level crossings.

physical review. b./physical review. b

Suppression of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math> depolarization by fast magnetic fluctuations at avoided level crossings for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">H</mml:mi><mml:msup><mml:mrow><mml:mi mathvariant="normal">o</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:…

Suppression of μ+ depolarization by fast magnetic fluctuations at avoided level crossings for Ho3+