Butterfly hysteresis curve is a signature of adiabatic Landau-Zener transition

Details Butterfly hysteresis curve is a signature of adiabatic Landau-Zener transition Butterfly hysteresis curve is a signature of adiabatic Landau-Zener transition

2005-07-26

arxiv.org/abs/cond-mat/0507618v1

Phys. Rev. B 73, 92412 -(4) (2006)

Physics

Condensed Matter

Statistical Mechanics

4 PR pages, 5 figures

Scientific paper

10.1103/PhysRevB.73.092412

We stress that the so-called butterfly hysteresis curves observed in dynamical magnetization measurements on systems of low-spin magnetic molecules such as V-15 and V-6 are a signature of adiabatic Landau-Zener transitions rather than that of a phonon bottleneck. We investigate the magnetization dynamics analytically with the help of a simple relaxation theory in the basis of the adabatic energy levels of the spin 1/2, to a qualitative accordance with experimental observations. In particular, reversible behavior is found near zero field, the corresponding susceptibility being bounded by the equilibrium and adiabatic susceptibilities from below and above, respectively.

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