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- W1575057798 abstract "Giant permittivity (ε′∼104) and ferromagnetism have been observed above 185K (including room temperature) in single crystals of the dilute semiconductor manganite-ferroelectromagnetic Eu0.8Ce0.2Mn2O5 in the investigations of x-ray diffraction, dielectric and magnetic properties, and conductivity. X-ray diffraction study has revealed a layered superstructure along the c axis at room temperature. A model of the state with giant ε′ including as-grown 2D layers with doping impurities, charge carriers, and double-exchange coupled Mn3+–Mn4+ ion pairs is suggested. At low temperatures these layers form isolated electrically neutral small-size 1D superlattices, in which de Haas van Alphen oscillations were observed. As temperature and hopping conductivity increase, charge-carrier self-organization in the crystal cause the formation of a layered superstructure consisting of charged layers (with an excess Mn3+) alternating with dielectric layers of the initial crystal—the ferroelectricity state due to charge ordering. Ferromagnetism results from double exchange between Mn3+ and Mn4+ ions through charge carriers in the charged layers." @default.
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- W1575057798 date "2010-06-01" @default.
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- W1575057798 title "Charge carrier self-organization in ferroelectromagnetic semiconductors Eu0.8Ce0.2Mn2O5" @default.
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- W1575057798 doi "https://doi.org/10.1063/1.3455792" @default.
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