Quantum Dynamics of Atomic Magnets: Cotunneling and Dipolar-Biased Tunneling
Résumé
Multispin tunneling cross relaxations in an ensemble of weakly coupled Ho3 ions, mediated by
weak anisotropic dipolar interactions, can be evidenced by ac-susceptibility measurements in a high
temperature regime. Based on a four-body representation, including the rare-earth nuclear spin, twoion
tunneling mechanisms can be attributed to both dipolar-biased tunneling and cotunneling processes.
The coreversal involving entangled pairs of magnetic moments is discussed with a particular emphasis,
giving new evidence to elucidate the many-body quantum dynamics in dipolar spin glasses.
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