Ferromagnetic - antiferromagnetic state in manganitesстатья
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.
Аннотация:Magnetic and electrical properties of La(1-x)SrxMnO3 (x = 0.1, 0.15 and 0.3) single-crystals, Eu0.7A0.3MnO3 (A = Ca, Sr) ceramics, and La0.84Sr0.16MnO3 and La0.1Pr0.6Ca0.3Mn)3 epitaxial thin films are investigated. Curves of T-dependence of the electrical resistivity and the magnetoresistance show the maxima near Curies= point and magnetoresistance is colossal in maximum. Distinction between the magnetizations and the remanences of zero-field-coolled and field-cooled sample an displacement of hysteresis loop of field-cooled sample are found in La0.9Sr0.1MnO3 single-crystals,Eu0.7A0.3MnO3 (A = Ca, Sr)ceramics and La0.84Sr0.16MnO3 and La0.1Pr0.6Ca0.3MnO3 epitaxial thin films.This displacement denotes that magnetic two-phase ferro - antiferromagnetic state is inherent in them. From this displacement the exchange integral |J| = 10^(-7) - 10^(-6) eV. described the Mn-O-Mn connection across droplet/host interface is calculated. The presence of ferromagnetic (F) and antiferromagnetic (AF) states in Eu0.7A0.3MnO3 (A = Ca, Sr)is confirmed by next facts: magnetization isotherms at T<TN (TN is Neel temperature) are superposition of linear part as for AF and small spontaneous magnetization due to the F droplets; paramagnetic Curie point is approximately three times as much than in EuMnO3, whereas TN is slightly varied. Behavior of electrical and magnetic properties are explained by presence of two-phase F-Af state due to strong s-d exchange.