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Electron paramagnetic resonance (EPR) measurements on single crystals of themolecular magnets Fe$_8$ and Mn$_{12}$ reveal complex nonlinearities in thelinewidths as functions of energy eigenstate, frequency, and temperature. Usinga density-matrix equation with distributions of the uniaxial anisotropyparameter $D$, the Land\'{e} $g$ factor, and dipolar interactions, we obtainlinewidths in good agreement with experiments. Our study shows that thedistribution in $D$ is common to the examined molecular magnets Fe$_8$ andMn$_{12}$ regardless of the qualities of the samples. This could provide thebasis for a proposed tunneling mechanism due to lattice defects. Thedistribution in $g$ is also quite significant for Mn$_{12}$.Comment: revised versio

physical review. b, condensed matter

Effects of<i>D</i>-strain,<i>g</i>-strain, and dipolar interactions on EPR linewidths of the molecular magnets<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<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…

Effects ofD-strain,g-strain, and dipolar interactions on EPR linewidths of the molecular magnetsFe8andMn