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The problem of the role of transverse fields in Mn12-acetate, a molecularnanomagnet, is still open. We present structural evidences that the disorder ofthe acetic acid of crystallization indices sizeable distortion of the Mn(III)sites, giving rise to six different isomers, four of them with symmetry lowerthan tetragonal. Using a ligand field approach the effect of the structuremodifications on the second order transverse magnetic anisotropy, forbidden intetragonal symmetry, has been evaluated. The order of magnitude of thequadratic transverse anisotropies well agree with the values derived by theanalysis of the field sweep dependence of the hysteresis loops performed byMertes et al.  (Phys. Rev. Lett 87, 227205 (2001)) and allows to better simulate the EPRspectra.Comment: submitted to Physical Review Letters 8 pages, 2 tables, 4 figures, 19  reference

physical review letters

Origin of Second-Order Transverse Magnetic Anisotropy in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">M</mml:mi><mml:mi mathvariant="normal">n</mml:mi></mml:mrow><mml:mn>12</mml:mn></mml:msub></mml:math>-Acetate

Origin of Second-Order Transverse Magnetic Anisotropy inMn12-Acetate