Low Temperature Magnetic Properties of Pr0.7(Ca,Sr)0.3CoO3 Oxides
I.G. Deac, A. Vlădescu, I. Balasz, A. Tunyagi and R. Tetean
Faculatea de Fizica, Universitatea Babes-Bolyai, Str. Kogalniceanu 1, Cluj-Napoca 400084, Romania
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We have investigated magnetic and magnetocaloric properties of Pr0.7(Ca1-xSrx)0.3CoO3, when the average size of the interpolated cation was changed. Pr0.7Ca0.3CoO3 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 ΔSM 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 ΔB=4 T, with reasonable good relative cooling power.
DOI: 10.12693/APhysPolA.120.306
PACS numbers: 75.47.Lx, 75.30.Kz, 75.30.Sg, 73.43.Qt