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Low Temperature Magnetic Properties of Pr_{0.7}(Ca,Sr)_{0.3}CoO_{3} Oxides

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Deac I., Vlădescu A., Balasz I., Tunyagi A., Tetean R.
Acta Physica Polonica A
|
2011
|
vol. 120
|
issue 2
306-310
EN
We have investigated magnetic and magnetocaloric properties of Pr_{0.7}(Ca_{1-x}Sr_{x})_{0.3}CoO_{3}, when the average size of the interpolated cation was changed. Pr_{0.7}Ca_{0.3}CoO_{3} has an orthorhombic Pnma symmetry and it shows a magnetic cluster-glass behavior below 70 K. When Sr partially replaces Ca in this compound, its magnetic properties are improved, and it begins to have ferromagnetic-like behavior. The magnetic transition temperature, gradually, increases with increasing Sr content, up to 170 K, for x=1. The electrical conduction also improved when Sr content increased. All the samples show negative magnetoresitance. Magnetic entropy change ΔS_{M} was estimated from isothermal magnetization data. We have found that it had higher values for the samples with x>0.5, around 1 J/kg K for Δ B=4 T, with reasonable good relative cooling power.
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