Abstract
Oxygen-deficient La0.67Sr0.33MnO3−α solid solutions have been studied. A comparison is made with the results obtained in an earlier study of a similar lanthanum-calcium manganite series. The physical characteristics of both series are accounted for as being due to a change in the Mn3+/Mn4+ ratio caused by oxygen removal. The differences between the strontium and calcium series originate from differences in both the bulk properties of the original oxygen-stoichiometric materials and their texture. In the strontium series, the texture manifests itself in intergrain magnetoresistance, which exceeds in magnitude the colossal magnetoresistance caused by bulk properties of the material. Study of the oxygen-deficient La0.67Sr0.33MnO3−α compound revealed specific features in the dependence of the electrophysical parameters on temperature and the Mn4+ fractional content that were not observed in the La0.67Ca0.33MnO3−α compound studied by us earlier and in La1−x SrxMnO3 samples described in the literature. The physics underlying these differences is discussed. A modified phase diagram relating the phase transition temperature to the Mn4+ fraction is proposed.
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Translated from Fizika Tverdogo Tela, Vol. 46, No. 11, 2004, pp. 2018–2024.
Original Russian Text Copyright © 2004 by Ba\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \)kov, Nikulin, Melekh, Egorov.
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Baikov, Y.M., Nikulin, E.I., Melekh, B.T. et al. Conductivity, magnetoresistance, and specific heat of oxygen-deficient La0.67Sr0.33MnO3−α (0≤α≤0.16). Phys. Solid State 46, 2086–2093 (2004). https://doi.org/10.1134/1.1825554
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DOI: https://doi.org/10.1134/1.1825554