Effects of D-strain, g-strain, and dipolar interactions on EPR linewidths of the molecular magnets Fe8 and Mn12

Details Effects of D-strain, g-strain, and dipolar interactions on EPR linewidths of the molecular magnets Fe8 and Mn12 Effects of D-strain, g-strain, and dipolar interactions on EPR linewidths of the molecular magnets Fe8 and Mn12

2001-06-14

arxiv.org/abs/cond-mat/0106276v3

PRB 65,014426 (2002)

Physics

Condensed Matter

revised version

Scientific paper

10.1103/PhysRevB.65.014426

Electron paramagnetic resonance (EPR) measurements on single crystals of the molecular magnets Fe$_8$ and Mn$_{12}$ reveal complex nonlinearities in the linewidths as functions of energy eigenstate, frequency, and temperature. Using a density-matrix equation with distributions of the uniaxial anisotropy parameter $D$, the Land\'{e} $g$ factor, and dipolar interactions, we obtain linewidths in good agreement with experiments. Our study shows that the distribution in $D$ is common to the examined molecular magnets Fe$_8$ and Mn$_{12}$ regardless of the qualities of the samples. This could provide the basis for a proposed tunneling mechanism due to lattice defects. The distribution in $g$ is also quite significant for Mn$_{12}$.

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