Physics – Condensed Matter – Materials Science
Scientific paper
2003-01-30
Physics
Condensed Matter
Materials Science
7 pages, including figures, accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.90.217204
We present detailed angle-dependent single crystal electron paramagnetic resonance (EPR) data for field rotations in the hard plane of the S=10 single molecule magnet Mn12-acetate. A clear four-fold variation in the resonance positions may be attributed to an intrinsic fourth order transverse anisotropy (O44). Meanwhile, a four-fold variation of the EPR lineshapes confirms a recently proposed model wherein disorder associated with the acetic acid of crystallization induces a locally varying quadratic (rhombic) transverse anisotropy (O22). These findings explain most aspects of the magnetic quantum tunneling observed in Mn12-acetate.
Dalal Naresh S.
Edwards Rachel S.
Hill Stephen
Jones Shaela I.
North J. M.
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