Вид документа : Статья из журнала Шифр издания : 54/K 75 Автор(ы) : Korolev A. V., Bazuev G. V. Заглавие : Paramagnetic and Spin-Glass Properties of Pyrochlore-Like Oxides Ln2Mn2/3Mo4/3O7 (Ln = Sm, Gd, Tb, or Y) Место публикации : Physics of the Solid State. - 2004. - Vol. 46, № 2. - С. 294-302: il. Примечания : Bibliogr. : p. 301-302 (22 ref.) ISSN: 1063-7834 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): оксиды комплексные--оксиды пирохлороподобные--магнитная восприимчивость Аннотация: The magnetic properties of complex oxides Ln2Mn2/3Mo4/3O7 (Ln = Sm, Gd, Tb, or Y) with a pyrochlore-type structure are studied in the temperature range 2–300 K. For all compounds in the paramagnetic state, the temperature dependence of the magnetic susceptibility is described by a generalized Curie–Weiss law with a temperature-independent component of ~10–6 cm3/g and with a Weiss constant Q 0 and Q| 16 K. At low temperatures (T 10–12 K), the compounds have spin-glass properties; they exhibit magnetic and temperature hysteresis and the typical dependences of the imaginary and real parts of the dynamic magnetic susceptibility on temperature and the frequency of an ac magnetic field in a wide range of magnetization relaxation times. The data obtained suggest that d electrons are responsible for the formation of frustrated exchange interactions in the compounds and that 4f electrons in the compounds with Sm or Tb provide strong magnetic-anisotropy effects Доп.точки доступа: Bazuev, G. V.; Базуев Г. В.