Phys. Rev. Lett. 90, 217204 (2003) [4 pages]Definitive Spectroscopic Determination of the Transverse Interactions Responsible for the Magnetic Quantum Tunneling in Mn12-AcetateReceived 30 January 2003; published 30 May 2003 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 fourfold variation in the resonance positions may be attributed to an intrinsic fourth-order transverse anisotropy (Ô44). Meanwhile, a fourfold variation of the EPR line shapes confirms a recently proposed model wherein disorder associated with the acetic acid of crystallization induces a locally varying quadratic (rhombic) transverse anisotropy [Ô22≡E(Ŝx2-Ŝy2)]. These findings explain most aspects of the magnetic quantum tunneling observed in Mn12-acetate. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.217204
DOI:
10.1103/PhysRevLett.90.217204
PACS:
75.50.Xx, 75.60.Jk, 75.75.+a, 76.30.–v
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