Abstract
Low-temperature dynamics of mesoscopic magnetic moments of a 0.1% at Ho3+-doped LiYF4 single crystal is probed by ac-susceptibility measurements above T=1.75 K. In the temperature and frequency range studied (1.75 K⩽T⩽5 K,10 Hz⩽f⩽1500 Hz), the results clearly show that both thermally activated quantum tunneling of a nearly isolated magnetic moment and spin–spin cross relaxations occur. This interpretation is strongly supported by the calculated electro-nuclear Zeeman diagram either of a single ion or of a pair of diluted ions.
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