Hysteresis loops and adiabatic Landau-Zener-Stückelberg transitions in the magnetic molecule V${}_6$

Abstract

We have observed hysteresis loops and abrupt magnetization steps in the magnetic molecule V${}_6$, where each molecule comprises a pair of identical spin triangles, in the temperature range 1-5 K for external magnetic fields $B$ with sweep rates of several Tesla/ms executing a variety of closed cycles. The hysteresis loops are accurately reproduced using a generalization of the Bloch equation based on direct one-phonon transitions between the instantaneous Zeeman-split levels of the ground state (an $S=1/2$ doublet) of each spin triangle. The magnetization steps occur for $B\approx 0$ and they are explained in terms of adiabatic Landau-Zener-Stückelberg transitions between the lowest magnetic energy levels as modified by inter-triangle anisotropic exchange of order 0.4 K.

4 pages, 3 figures

References in corpus (4)

• Butterfly hysteresis loop and dissipative spin reversal in the S=1/2, V15 molecular complex
• Adiabatic Landau-Zener-Stückelberg transition with or without dissipation in low spin molecular system V15
• Quantum Tunneling in Half-Integer Spin Systems
• Noise effect on the nonadiabatic transition and correction to the tunneling energy gap estimated by the Landau-Zener-Stuckelberg formula

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