1999/11/30 by I. Chiorescu, W. Wernsdorfer, A. Müller +2 · 3 citations
Chemistry · Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Polyoxometalates: Synthesis and Applications #Vanadium and Halogenation Chemistry #cond-mat.mes-hall
paper · pdf · doi:10.1016/s0304-8853(00)00385-1
published as J. Magn. Magn. Mat., vol. 221/1-2, p. 103-109, oct. 2000 · REVTeX/LaTeX, 5 figures
arxiv created 2000/02/14 · openalex publication_date 2000/11/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The V15 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 (215 in V15, 108 in Mn12-ac). It is a low-spin/big-molecule with spin S=1/2. Contrary large-spins/big-molecules of the Mn12-ac type, V15 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).