Magnetostriction and thermal expansion anomalies near the Curie point of the compound La0.7Sr0.3MnO3 with the perovskite structureстатья
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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
Аннотация:It is found that the bulk part omega of the magnetostriction near the Curie temperature Tc in a La0.7Sr0.3MnO3 single crystal with the perovskite structure is negative and that the temperature dependence of |omega| has a maximum near Tc. The quantity |omega| at the maximum increases rapidly with increasing magnetic field. The thermal expansion coefficient near Tc increases with temperature much faster than lineary. The paramagnetic Curie temperature determined from the Curie-Weiss law, which the paramagnetic susceptibility of this crystal satifies, was found to be lower than Tc. These anomalies and also the near Tc metal-insulator transition which is characteristic for this material are explained by the existence of a magnetically two-phase state consisting of a conducting ferromagnetic matrix containing antiferromagnetic insulating microregions occupying not more than 5% of the sample volume.