Nonadiabatic Landau Zener tunneling in Fe_8 molecular nanomagnets

Details Nonadiabatic Landau Zener tunneling in Fe_8 molecular nanomagnets Nonadiabatic Landau Zener tunneling in Fe_8 molecular nanomagnets

2000-01-24

arxiv.org/abs/cond-mat/0001346v2

Europhys.Lett. 50 (4), pp.552 558 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 6 figures

Scientific paper

10.1209/epl/i2000-00305-x

The Landau Zener method allows to measure very small tunnel splittings \Delta in molecular clusters Fe_8. The observed oscillations of \Delta as a function of the magnetic field applied along the hard anisotropy axis are explained in terms of topological quantum interference of two tunnel paths of opposite windings. Studies of the temperature dependence of the Landau Zener transition rate P gives access to the topological quantum interference between exited spin levels. The influence of nuclear spins is demonstrated by comparing P of the standard Fe_8 sample with two isotopically substituted samples. The need of a generalized Landau Zener transition rate theory is shown.

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