Magnetostriction and thermal expansion anomalies near the Curie point of the compound La0.7Sr0.3MnO3 with the perovskite structure |
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Authors: | L I Koroleva R V Demin A M Balbashov |
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Institution: | (1) M. V. Lomonosov Moscow State University, 119899 Moscow, Russia;(2) Moscow Power Engineering Institute, 111250 Moscow, Russia |
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Abstract: | It is found that the bulk part ω of the magnetostriction near the Curie temperature T
c
in a La0.7Sr0.3MnO3 single crystal with the perovskite structure is negative and that the temperature dependence of |ω| has a maximum near T
c
. The quantity |ω| at the maximum increases rapidly with increasing magnetic field. The thermal expansion coefficient near
T
c increases with temperature much faster than linearly. The paramagnetic Curie temperature determined from the Curie-Weiss
law, which the paramagnetic susceptibility of this crystal satifies, was found to be lower than T
c
. These anomalies and also the near-T
c
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.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 6, 449–453 (25 March 1997) |
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Keywords: | |
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