Abstract
A Berry phase in the path integral for spin gives rise to an interference effect in the tunneling of a biaxially symmetric spin Hamiltonian. As the magnetic field applied along a hard axis is varied, the tunnel splitting between the two lowest energy states oscillates, with field values where it is completely quenched. This Hamiltonian is realized in Fe 8-tacn molecules, where these oscillations have just now been seen and provide, in fact, strong evidence for tunneling below 0.36 K in the first place.
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