|
ИСТИНА |
Войти в систему Регистрация |
ФНКЦ РР |
||
Magnetically two-phase state in Eu(1-x)A(x)MnO(3) (A = Ca, Sr)статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Abramovich A.I., Demin R.V., Koroleva L.I., Michurin A.V., Smirnitskaya A.I.
- Журнал: JETP Letters
- Том: 69
- Номер: 5
- Год издания: 1999
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 404
- Последняя страница: 410
- DOI: 10.1134/1.568042
- Аннотация: It is observed that low-temperature magnetic properties (dependence of the magnetization on the cooling conditions and the presence of a maximum in the initial magnetic susceptibility) of Eu(1-x)A(x)MnO(3) (A=Ca, Sr; x=0,0.3) samples are similar to those of spin glasses. However, there are also substantial differences: The magnetization depends on the cooling conditions right up to the maximum measurement fields H=45 kOe, and the temperature of T-N of the maximum of the initial magnetic susceptibility is independent of the frequency of the ac magnetic field in which the susceptibility is measured. The magnetization isotherms for T less than or equal to T-N are a superposition of a linear part, characteristic for an antiferromagnet, and a small spontaneous part. For compositions containing Sr a maximum of the resistivity rho (rho(max) similar to 108 Ohm . cm) is observed near T-N ; in a 120 kOe magnetic field this maximum is lowered by four orders of magnitude and the temperature of the maximum is two times higher. In compositions with x=0.3 the paramagnetic Curie point is much higher than for the composition with x=0: theta=110 K (A=Ca), 175 K (A=Sr), and -100 K (x=0). These characteristic features of the magnetic and electric properties are explained by the existence of a magnetically two- phase state in this system, consisting of ferromagnetic clusters, in which the charge carriers are concentrated, embedded in an insulating antiferromagnetic matrix. (C) 1999 American Institute of Physics. [S0021-3640(99)00805-1].
- Добавил в систему: Абрамович Анна Ивановна