In a longitudinal μ+SR experiment on a high-purity α-Fe single crystal sphere magnetically saturated in a 〈 111 〉 direction damped oscillations (wiggles) were observed in a temperature range 30 mK to 600 mK and in a certain regime of applied magnetic fields Bappl. Meassurements of the wiggle frequency as a function of Bappl give us directly the Fermi field BFermi=(-1.13±0.02)T and the dipolar magnetic field |Bdip∥|=(0.66±0.03)T. Bdip∥ was used to determine the prefactor in the Arrhenius law obeyed by the μ+ hopping rate between 100 K and 1000 K. A comparision with the corresponding values for protons and deuterons suggests diffusion via the adiabatic mechanism.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics
- Condensed Matter Physics
- Physical and Theoretical Chemistry