The quantum dynamics of atomic magnets, co-tunneling and dipolar-biased tunneling

Details The quantum dynamics of atomic magnets, co-tunneling and dipolar-biased tunneling The quantum dynamics of atomic magnets, co-tunneling and dipolar-biased tunneling

2003-07-16

arxiv.org/abs/cond-mat/0307405v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 figures

Scientific paper

10.1103/PhysRevLett.91.257204

Multi-spins tunneling cross-relaxations in an ensemble of weakly-coupled Ho$^{3+}$ 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, two-ions tunneling mechanisms can be attributed to both dipolar-biased tunneling and co-tunneling processes. The co-reversal involving entangled pairs of magnetic moments is discussed with a particular emphasis, giving new evidences to elucidate the many-body quantum dynamics.

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