2003/01/31 by S. Hill, Stephen Hill, R. S. Edwards +5 · 4 citations
Biochemistry, Genetics and Molecular Biology · Materials Science · Physics and Astronomy · #Anisotropy #Atomic physics #Condensed matter physics #Electron Spin Resonance Studies #Electron paramagnetic resonance #Lanthanide and Transition Metal Complexes #Magnetism in coordination complexes #Nuclear magnetic resonance #Physics #Quantum mechanics #Quantum tunnelling #Resonance (particle physics) #Transverse plane #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.90.217204
7 pages, including figures, accepted for publication in Phys. Rev. Lett
arxiv created 2003/04/10 · openalex publication_date 2003/05/30 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 Mn(12)-acetate. A clear fourfold variation in the resonance positions may be attributed to an intrinsic fourth-order transverse anisotropy (O(4)/(4)). 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 [O (2)/(2) identical with E(S (2)/(x)-S(2)/(y))]. These findings explain most aspects of the magnetic quantum tunneling observed in Mn(12)-acetate.