ISSN:
1862-0760
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We have used three soft-chemistry methods for the efficient preparation of Ln1−xSrxCoO3 samples, adapting the combustion and the liquid-mix methods for the synthesis of the Ln = La and Gd compounds, respectively, and the preparation of Nd1−xSrxCoO3 by the nitrate decomposition method. We report the magnetic and electrical properties of these relatively small particle-size materials, specially in the case of the Ln = La and Ln = Nd series (d≈0.2 µm and 0.5 µm, respectively), and we compare them to those displayed by the corresponding compounds prepared at higher temperatures. The compounds here obtained are ferromagnetic for x≥0.15 when Ln = La and for x≥0.20 when Ln = Nd and Gd. Their resistivity decreases as the doping degree increases. And, very interestingly, for compositions 0.20〈x≤0.45, when Ln = La, and for x=0.40, when Ln = Nd, they show M-I transitions as the temperature rises. These are very sensitive to the application of electrical current and its polarity and the presence of magnetic fields, displaying peculiar behaviors.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02375955
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