Symmetry of Magnetic Quantum Tunneling in Single Molecule Magnet Mn12-acetate

Details Symmetry of Magnetic Quantum Tunneling in Single Molecule Magnet Mn12-acetate Symmetry of Magnetic Quantum Tunneling in Single Molecule Magnet Mn12-acetate

2003-04-09

arxiv.org/abs/cond-mat/0304206v2

Phys. Rev. Lett. 91, 047203-1 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages and 3 figures

Scientific paper

10.1103/PhysRevLett.91.047203

The symmetry of magnetic quantum tunneling has been studied in the prototype single molecule magnet Mn$_{12}$-acetate using a micro-Hall effect magnetometer and superconducting high field vector magnet system. An average crystal fourfold symmetry is shown to be due to local molecular environments of twofold symmetry that are rotated by 90$^o$ with respect to one another, confirming that disorder which lowers the molecule symmetry is at important to magnetic quantum tunneling. We have studied a subset of these lower (twofold) site symmetry molecules and present evidence for a Berry phase effect consistent with a local twofold symmetry.

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