Semiconductive and Photoconductive Properties of the Single Molecule Magnets Mn12-Acetate and Fe8Br8

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dc.creatorNorth, J. M.
dc.creatorZipse, D.
dc.creatorDalal, N. S.
dc.creatorChoi, E. S.
dc.creatorJobiliong, E.
dc.creatorBrooks, J. S.
dc.creatorEaton, D. L.
dc.date2003-01-27
dc.date.accessioned2026-07-07T02:49:22Z
dc.date.available2026-07-07T02:49:22Z
dc.descriptionResistivity measurements are reported for single crystals of Mn12-Acetate and Fe8Br8. Both materials exhibit a semiconductor-like, thermally activated behavior over the 200-300 K range. The activation energy, Ea, obtained for Mn12-Acetate was 0.37 +/- 0.05 eV, which is to be contrasted with the value of 0.55 eV deduced from the earlier reported absorption edge measurements and the range of 0.3-1 eV from intramolecular density of states calculations, assuming 2Ea = Eg, the optical band gap. For Fe8Br8, Ea was measured as 0.73 +/- 0.1 eV, and is discussed in light of the available approximate band structure calculations. Some plausible pathways are indicated based on the crystal structures of both lattices. For Mn12-Acetate, we also measured photoconductivity in the visible range; the conductivity increased by a factor of about eight on increasing the photon energy from 632.8 nm (red) to 488 nm (blue). X-ray irradiation increased the resistivity, but Ea was insensitive to exposure.
dc.description7 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0301515
dc.identifierhttp://arxiv.org/abs/cond-mat/0301515
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/20768
dc.subjectMaterials Science
dc.titleSemiconductive and Photoconductive Properties of the Single Molecule Magnets Mn12-Acetate and Fe8Br8
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