Experimental evidence for a magnetic two-phase state in manganitesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
Аннотация:It is found that samples of manganites La0.9Sr0.1MnO3 (single crystal), Eu0.7Ao.3MnO3 (A=Ca, Sr; ceramics), and La0.1Pr0.6Ca0.3MnO3 and La0.84Sr0.16MnO3 (thin epitaxial films)that are either field-cooled (in magnetic field) or zero-field-cooled differ in low-temperature magnetization, and hysteresis loop of field-cooled samples exhibits a displacement. This displacement signifies that na ferro-antiferromagnetic state occurs in these samples. The exchange integral J~10^(-6) eV is calculated from this displacement, which describes the exchange Mn-O-Mn coopling through the interface ferromagnetic droplet - antiferromagnetic matrix. The magnetoresistance and volume magnetostriction of La(1-x)SrxMnO3 single crystals exhibit similar dependences on x, temperature, and the magnetic field in the vicinity of the Curie point, which points to the fact that these dependences are due to the same reason, namely, the occurence of a magnetic two-phase ferro-antiferromagnetic stste caused by strong s-d exchange.