Abstract

The optical constants were measured at room temperature in the photon-energy range 0.6–6.5 eV on evaporated thin films. Evaporation conditions were chosen that gave the α-Mn crystal structure with relatively large grains. The optical conductivity was separated into intraband and interband contributions by fitting to the Drude formula at low energies. The results are anomalous in comparison to other 3d transition metals: the free-electron lifetime is exceptionally short (in agreement with the large dc resistivity of Mn), and the interband transitions seem unusually weak at the lower energies. We discuss possible explanations related to the complicated crystal structure of α-Mn with its loss of point symmetry at the atom sites.

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