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Antiferron states of charge carriers in the ferromagnetic semiconductors CuCr2S(4-x)Sex (0.5<=x<=1.5) with Curie points above room temperatureстатья
Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
- Автор: Koroleva L.I.
- Журнал: Journal of Experimental and Theoretical Physics
- Том: 79
- Номер: 1
- Год издания: 1994
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 153
- Последняя страница: 162
- Аннотация: A semiconductor type of conduction has been discovered in CuCr2S(4-x)Sex, which is a solid solution of the two ferromagnetic chalcogenide spinels CuCr2S4 and CuCr2Se4 with a metallic type of conduction, when 0.5<=x<=1.5. The semiconducting samples exhibit decreased values of the magnetic moments, the Curie points, and the anomalous Hall effect in comparison with extreme compounds. The paramagnetic susceptibility of all the samples obeys the Curie-Weiss law, the paramagnetic Curie temperature teta being below the Curie temperature Tc. A large blue shift of the absorption edge (~0.15 eV), which is associated with ferromagnetic ordering, has been discovered for semiconducting sample, allowing the existence in them of antiferrons (microregions with disrupted ferromagnetic ordering created by the self-trapping of charge carriers in them due to a gain in the energy of interband s-d exchange). A calculation has shown that the descreased values of the magnetic moment in the semiconducting samples are attributable to existence of antiferrons including three bor four Cr^(+3)ion near selenium ions.
- Добавил в систему: Королёва Людмила Ивановна