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Article Dans Une Revue Physical Review Letters Année : 2003

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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hal-01656622 , version 1 (05-12-2017)

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R. Giraud, W. Wernsdorfer, A. M. Tkachuk, D. Mailly, B. Barbara. Quantum Dynamics of Atomic Magnets: Cotunneling and Dipolar-Biased Tunneling. Physical Review Letters, 2003, 91 (25), pp.257204. ⟨10.1103/PhysRevLett.91.257204⟩. ⟨hal-01656622⟩

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