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- W1970565589 abstract "The influence of the crystalline and electronic structures of light, heavy and alkaline rare earths on their optical properties in the energy range extending from 1.6 to 6.2 eV is demonstrated. The data show that the optical conductivity differs for each group. Results are given for trivalent La (d.h.c.p.) and Lu (h.c.p.) and divalent Yb (f.c.c.) and Eu (b.c.c.). Light and heavy rare earths exhibit an absorption peak whose position near 5.7 eV is practically independent of thickness. For heavy rare earths another broad peak occurs between 2.5 and 3.2 eV. In contrast, Yb and Er behave like the alkaline metals Sr and Ba respectively. In the UV range the conductivity of Eu exhibits a broad peak between 4.5 and 5.15 eV. Such a structure does not occur for Yb in this range. In the IR range a slight shoulder is found near 2.12 eV for Eu and near 2.8 eV for Yb. Theoretically, we suggest the presence of indirect transitions between the 4f states and the Fermi level, which give rise to the structure near 5.7 eV for light and heavy metals. For the latter, the mean value of the energies associated with allowed direct interband transitions agrees with the optical anomaly located between 2.5 and 3.5 eV. For Eu, interband transitions occur between 4 and 5.5 eV. The phenomena which occur between 1.5 and 2.4 eV are correlated with the granular structure of the films. For Yb, interband absorption occurs at higher values (above 6 eV)." @default.
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- W1970565589 date "1976-10-01" @default.
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- W1970565589 title "Optical conductivity of rare-earth thin films in relation to their crystalline structure and electronic configuration" @default.
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- W1970565589 doi "https://doi.org/10.1016/0040-6090(76)90282-0" @default.
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