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- W2253608052 abstract "Optical reflectivity of single crystals of Eu$sub 3$O$sub 4$ was investigated in the photon energy range between 0.03 and 12 eV. Dielectric functions were derived by means of a Kramers--Kronig analysis and interpreted with lattice vibrations and interband transitions from initial Eu$sup 2+$, Eu$sup 3+$, and 2p$sup 6$ states into crystal-field-split 5d bands. In addition, intra 4f$sup 6$ transitions were observed and commented on. The Coulomb correlation energy between Eu$sup 2+$ and Eu$sup 3+$ was found experimentally. Optical transmission measurements at low temperatures revealed a blue shift of the absorption edge for temperatures above the Neel point T/sub N/ and in zero external magnetic fields and a red shift of the absorption edge for magnetic fields larger than a critical field H/sub c/ = 2.4 kOe, confirming the metamagnetic phase. T/sub N/ is found to be 5.2 +- 0.2$sup 0$K. (auth)" @default.
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- W2253608052 date "1975-11-01" @default.
- W2253608052 modified "2023-09-24" @default.
- W2253608052 title "Electronic structure of a mixed valence system: Eu$sub 3$O$sub 4$" @default.
- W2253608052 hasPublicationYear "1975" @default.
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