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

• Authors: I. Deac , A. Vlădescu , I. Balasz , A. Tunyagi , R. Tetean
• Languages of publication: EN

Abstracts

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.

Keywords

EN

75.47.Lx; 75.30.Kz; 75.30.Sg; 73.43.Qt

Discipline

• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)
• 75.47.Lx: Magnetic oxides
• 73.43.Qt: Magnetoresistance(see also 75.47.-m Magnetotransport phenomena; materials for magnetotransport in magnetic properties and materials)
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 120
• Issue: 2
• Pages: 306-310

Dates

published

2011-08

Contributors

author

I. Deac

• Faculatea de Fizica, Universitatea Babes-Bolyai, Str. Kogalniceanu 1, Cluj-Napoca 400084, Romania

author

A. Vlădescu

• Faculatea de Fizica, Universitatea Babes-Bolyai, Str. Kogalniceanu 1, Cluj-Napoca 400084, Romania

author

I. Balasz

• Faculatea de Fizica, Universitatea Babes-Bolyai, Str. Kogalniceanu 1, Cluj-Napoca 400084, Romania

author

A. Tunyagi

• Faculatea de Fizica, Universitatea Babes-Bolyai, Str. Kogalniceanu 1, Cluj-Napoca 400084, Romania

author

R. Tetean

• Faculatea de Fizica, Universitatea Babes-Bolyai, Str. Kogalniceanu 1, Cluj-Napoca 400084, Romania

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Identifiers

DOI

10.12693/APhysPolA.120.306