Abstract
A single-molecule magnet displays asymmetric Berry-phase interference patterns in the transverse-field () dependence of the magnetization tunneling probability when a longitudinal field () is present, contrary to symmetric patterns observed for . Reversal of results in a reflection of the transverse-field asymmetry about , as expected on the basis of the time-reversal invariance of the spin-orbit Hamiltonian which is responsible for the tunneling oscillations. A fascinating motion of Berry-phase minima within the transverse-field magnitude-direction phase space results from a competition between noncollinear magnetoanisotropy tensors at the two distinct Mn sites.
- Received 24 November 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.227201
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