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

Abstract

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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References in corpus (3)

• Theory of the spin bath
• Nuclear spin driven quantum relaxation in LiY_0.998Ho_0.002F_4
• Spin-spin cross-relaxation in single-molecule magnets

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