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• W2004456308 abstract "At room pressure and temperature the system EuO1−xNx has two solid-solubility ranges, each with the NaCl structure: for 0⩽x ⩽ 0.30 the system is ferromagnetic and semiconducting above the Curie temperature; for 0.92 ⩽ x < 1 it is metallic. Conductivity and Seebeck voltages indicate intrinsic behaviour above 310K with an energy gap that decreases with increasing x for 0⩽x ⩽ 0.30. Magnetic susceptibilities are consistent with 4f6 configurations at x europium ions per molecule and a ferromagnetic Curie temperature Tc that increases with x. Low-temperature transport measurements were made only for 0.20⩽x ⩽ 0.30: a minimum in the electrical conductivity, approximately 30 K above Tc correlates well with the onset of an anomalous low-temperature crystal contraction and with deviations from a Curie-Weiss law typical of short-range magnetic order. Below Tc there is a metal-to-semiconductor transition similar to that found in EuO1−δ. The magnitude of the negative Seebeck coefficient increases with T between Tc and 310 K as might be expected for an extrinsic conductor with a transport contribution similar to the kinetic contribution, as in a metal. These properties are interpreted in terms of a Eu: 5d conduction band, a two-electron donor level at oxygen vacancies, and a (Eu2+:4f7) localized-electron level that lies 1.1 eV below the bottom of the 5d conduction band in EuO and above it in the nitrogen-rich metallic phase. In the oxygen-rich semiconducting phase of EuO1−xNx, an electron-configuration transition 4f75d0 → 4f65d1 occu atoms, the 5d1 electron simultaneously being donated to a covalent Eu-N bond. The configuration transition raises the 4f7level above the bottom of the 5d band producing a small polaron of anomalously large energy. No small polaron anomaly is found in metal deficient Eu1−δO; the configuration transition is apparently induced by the more strongly covalent Eu-N bonding. The excited electron configuration gives a ferromagnetic direct-exchange Eu-Eu interaction that appears to dominate the ferromagnetic superexchange term." @default.
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• W2004456308 date "1978-01-01" @default.
• W2004456308 modified "2023-10-13" @default.
• W2004456308 title "Les oxynitrures d'europium semiconducteurs ferromagnetiques. Proprietes magnetiques et electriques" @default.
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• W2004456308 doi "https://doi.org/10.1016/0022-3697(78)90033-1" @default.
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