Non-adiabatic Landau-Zener transitions in low spin molecular magnet V15

Details Non-adiabatic Landau-Zener transitions in low spin molecular magnet V15 Non-adiabatic Landau-Zener transitions in low spin molecular magnet V15

1999-11-12

arxiv.org/abs/cond-mat/9911180v2

J. Magn. Magn. Mat., vol. 221/1-2, p. 103-109, oct. 2000

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

REVTeX/LaTeX, 5 figures

Scientific paper

10.1016/S0304-8853(00)00385-1

The V_{15} polyoxovanadate molecule is made of 15 spins 1/2 with antiferromagnetic couplings. It belongs to the class of molecules with very large Hilbert space dimension (2^{15} in V_{15}, 10^8 in Mn_{12}-ac). It is a low-spin/big-molecule with spin S=1/2. Contrary large-spins/big-molecules of the Mn_{12}-ac type, V_{15} has no energy barrier against spin rotation. Magnetization measurements have been performed and despite the absence of a barrier, magnetic hysteresis is observed over a timescale of several seconds. This new phenomenon characterized by a "butterfly" hysteresis loop is due to the effect of the environment on the quantum rotation of the entangled 15 spins of the molecule, in which the phonon density of states is not at its equilibrium (phonon bottleneck).

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