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New features to increase the thermopower in magnetic semiconductors Iстатья
- Авторы: Koroleva L.I., Morozov A.C., Batashev I.K., Balbashov A.M.
- Журнал: International journal of magnetism and nuclear science
- Том: 1
- Номер: 2
- Год издания: 2016
- Первая страница: 11
- Последняя страница: 15
- Аннотация: In this paper thermopower S, magnetothermopower ΔS/S were studied in single-crystal Sm¬(1-x)-Sr¬x¬MnO¬3¬ (0.15≤x≤0.3). It is known that these compounds consist of ferron-type ferromagnetic clusters in A-type antiferromagnetic matrix. A sharp increase of S and module of negative ΔS/S were discovered near Curie temperature T¬C, where they achieve giant values. So |ΔS/S|=94.5% in magnetic field 13.23 kOe. This means that thermopower is caused by presence of ferrons, as the value of the thermopower slumps with ferrons’ destruction caused by magnetic field or heating over T¬C. Therefore thermopower in doped magnetic semiconductors is determined by level of doping and volume of the sample. So after dividing the sample in two parts thermopower of each part decreased proportionally the volume of the sample. Thus, in doped magnetic semiconductors the value of thermopower can be considerably increased by enlarging the volume of sample, the level of doping and can be controlled by magnetic field.
- Добавил в систему: Королёва Людмила Ивановна