Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-12-07
J. Appl. Phys. -- May 1, 2000 -- Volume 87, Issue 9, pp. 5481-5486
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 14 figures, conference proceedings of MMM 1999, San Jose, 15-18 Nov., session number CD-01
Scientific paper
10.1063/1.373379
We present details about an experimental method based on the Landau Zener model which allows to measure very small tunnel splittings $\Delta$ in molecular clusters Fe8. The measurements are performed with an array of micro-SQUIDs. 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. Transitions between M = -S and (S - n), with n even or odd, revealed a parity (symmetry) effect which is analogous to the suppression of tunneling predicted for half integer spins. This observation is the first direct evidence of the topological part of the quantum spin phase (Berry phase) in a magnetic system. The influence of intermolecular dipole interactions on the measured tunnel splittings $\Delta$ are shown.
Caneschi Andrea
Cornia Andrea
Gatteschi Dante
Mailly Dominique
Sessoli Roberta
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