Asymmetric Berry-Phase Interference Patterns in a Single-Molecule Magnet

Abstract

A Mn4 single-molecule magnet displays asymmetric Berry-phase interference patterns in the transverse-field (HT) dependence of the magnetization tunneling probability when a longitudinal field (HL) is present, contrary to symmetric patterns observed for HL=0. Reversal of HL results in a reflection of the transverse-field asymmetry about HT=0, 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.

4 double-column pages

References in corpus (6)

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• Symmetry of Magnetic Quantum Tunneling in Single Molecule Magnet Mn12-acetate
• Influence of antisymmetric exchange interaction on quantum tunneling of magnetization in a dimeric molecular magnet Mn6
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• Tunneling and inversion symmetry in single-molecule magnets: the case of the Mn12 wheel molecule

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• Thermodynamics of a Quantum Ising system coupled to a spin bath: Zero Temperature Results
• Berry-phase effect in single molecule magnets: analytical and numerical results