Manifestation of intermediate spin for Fe$_{8}$

Details Manifestation of intermediate spin for Fe$_{8}$ Manifestation of intermediate spin for Fe$_{8}$

1999-07-19

arxiv.org/abs/cond-mat/9907257v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages no figures

Scientific paper

Intermediate spin, which occurs in the theory of anyons, can also be exhibited by mesoscopic magnetic particles. The necessary broken time reversal symmetry is due to a suitably directed magnetic field. As a function of this field a system passes periodically through points which correspond to whole or half-integer spin. Intermediate spin is defined by fields which lie between these points. Since the tunnel splitting in the ground doublet vanishes for half-integer spin, this splitting becomes periodic. The doubly periodic oscillations observed in the magnetic molecular cluster Fe$_{8}$ represent the first unequivocal observation of this phenomena. Here the whole or half-integer nature of the system, i.e., the parity, is periodic for a field which is along either the easy or hard axis or a suitable combination of the two. A detailed theory is presented.

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