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- W2024704861 abstract "Annealing experiments carried out on calcium doped yttrium iron garnet (Ca:YIG) in an oxygen-reducing atmosphere, show dramatic decreases in the magnetisation over the entire temperature range. Simultaneously, the electric resistivity and the electric activation energy significantly increase. Within the framework of the iron-oxygen cluster model, we analyse and compare with each other two situations, in which compensating holes can be found. The first is their occupying hybridised eigen-energy levels of the cluster. In this case, it can be shown at which ions the holes tend to remain for a given energy level. It turns out that the active holes remain localised most at the oxygen ions. The other situation means the hole's localisation in an attractive trap centre. The latter is created at the missing oxygen ion between the tetrahedral and octahedral iron-oxygen ionic clusters in the proximity of a doping Ca2+ ion. For a sufficiently shallow traps, their localised states can be considered within the framework of hydrogen-like model. The ground state energy of the vacancy can thus be estimated, considering the dielectric constant of the host material and the hole's effective mass as variational parameters. Communication between the tetrahedral and octahedral ironoxygen clusters with missing oxygen between them, is assumed to be maintained via the s − d hybridisation." @default.
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- W2024704861 date "2006-02-28" @default.
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- W2024704861 title "A microscopic model of oxygen vacancies inCa-dopedYIG" @default.
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- W2024704861 doi "https://doi.org/10.1088/1742-6596/30/1/033" @default.
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