Butterfly hysteresis loop and dissipative spin reversal in the S=1/2, V15 molecular complex

Details Butterfly hysteresis loop and dissipative spin reversal in the S=1/2, V15 molecular complex Butterfly hysteresis loop and dissipative spin reversal in the S=1/2, V15 molecular complex

1999-10-07

arxiv.org/abs/cond-mat/9910117v2

Phys. Rev. Lett., vol. 84, no. 15, p. 3454, 2000.

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

LaTeX/RevTeX, 3 figures.Approved for publication in PRL

Scientific paper

10.1103/PhysRevLett.84.3454

Time resolved magnetization measurements have been performed on a spin 1/2 molecular complex, so called V$_{15}$. Despite the absence of a barrier, magnetic hysteresis is observed over a timescale of several seconds. A detailed analysis in terms of a dissipative two level model is given, in which fluctuations and splittings are of same energy. Spin-phonon coupling leads to long relaxation times and to a particular "butterfly" hysteresis loop.

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