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The variation with microwave frequency and temperature of previously reportedanomalous peaks in the EPR spectra of Mn12-acetate, under large transversefields, reveals that the molecular easy magnetization axes are tilted withrespect to the global symmetry direction. More importantly, on the basis of theangle-dependence of fine structures observed in the EPR spectra we infer thatthe tilt distribution must be discrete, as was previously suspected fromstudies which demonstrated the presence of a locally varying rhombic anisotropy[S. Hill et al., Phys. Rev. Lett. 90, 217204 (2003)]. The tilts are confined totwo orthogonal planes, and the distribution extends up to ~1.7 degrees awayfrom the the global easy (z-) axis. We ascribe the tilting to thehydrogen-bonding effect associated with the disordered acetic acid solventmolecules. The effect is considerably larger than deduced from x-raydiffraction analyses. These data constitute the sought-after evidence for thepresence of transverse fields in Mn12-acetate, and provide a possibleexplanation for the lack of selection rules in the resonant quantum tunnelingbehavior seen in low-temperature hysteresis experiments for this S = 10 system.

physical review. b, condensed matter and materials physics

Discrete easy-axis tilting in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-acetate, as determined by EPR: Implications for the magnetic quantum tunneling mechanism

Discrete easy-axis tilting inMn12-acetate, as determined by EPR: Implications for the magnetic quantum tunneling mechanism