Giant volume magnetostriction and colossal magnetoresistance in La0 7Ba0 3MnO3 at room temperatureстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:In single-crystal La0.7Ba0.3MnO3 giant volume magnetostriction was observed for the first time to reach 2.54 x 10^(-4) at room temperature and a still larger level of 4 x 10^(-4) at the Curie point Tc=310 K in a magnetic field of 8.2 kOe. At the same temperatures and magnetic field, this effect is complemented by a colossal magnetoresistance of 15.2 and 22,7%. The volume magnetostriction omega and magnetoresistance follow similar patterns in the proximity of Tc: namely, omega and magnetoresistance are negative, maxima are observed in the module omega from T and module magnetoresistance from T curves, and the omega and magnetoresistance isotherms do not saturate in the highest fields applied.These phenomena are assigned to the fact that, in the above composition, there exists a two-phase magnetic (ferromagnetic-antiferromagnetic) state induced by strong s-d exchange.