Tunneling of magnetization versus spin-phonon and spin-spin transitions in LiY0.998Ho0.002F4
R. Giraud, W. Wernsdorfer, A. M. Tkachuk, D. Mailly, B. Barbara
Abstract
Strong hyperfine coupling in a 0.2% Holmium doped LiYF4 single crystal induces staircaselike hysteresis loops of the magnetization at very low temperatures. The field sweep rate dependence of hysteresis loops allows the study of two different regimes in the magnetic relaxation of these weakly coupled magnetic moments. At slow field sweep rates, quantum tunneling of the magnetization occurs at avoided level crossings in the low-energy scheme of a single ion Ho3+. At faster sweep rates, nonequilibrated spin-phonon and spin-spin transitions, mediated by weak dipolar interactions, lead to magnetization oscillations and additional steps.
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