ISSN:
1090-6487
Keywords:
75.80.+q
;
75.30.Kz
;
75.40.−s
;
74.72.Yg
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.567382
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