Investigation of magnetic and transport properties of PrCa(MnCo)O prepared by solid state process

Magnetic, magnetocaloric and electrical properties in distorted orthorhombic system Pr0.7Ca0.3Mn0.98Co0.02O3 has been studied. Complex impedance analysis confirms the contribution of grain boundary on the conduction process. The latter is dominated by thermally activated hopping mechanism. The sampl...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2017-02, Vol.423, p.20-26
Main Authors: Khelifi, M., M’nassri, R., Selmi, A., Rahmouni, H., Khirouni, K., Boudjada, N. Chniba, Cheikhrouhou, A.
Format: Article
Language:English
Subjects:
Chemical Sciences
Conductivity
Cristallography
Curie-Weiss law
Dielectrics
Electrical properties
Electrical resistivity
Entropy
Ferromagnetism
Grain boundaries
Hopping conduction
Hopping mechanism
Impedance analysis
Landau analysis
Magnetic fields
Magnetic measurement
Magnetic properties
Magnetism
Magnetocaloric properties
Phase transitions
Solid state
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Summary:Magnetic, magnetocaloric and electrical properties in distorted orthorhombic system Pr0.7Ca0.3Mn0.98Co0.02O3 has been studied. Complex impedance analysis confirms the contribution of grain boundary on the conduction process. The latter is dominated by thermally activated hopping mechanism. The sample exhibits two relaxations phenomena. Only one process persists at higher temperatures. Conductivity analysis indicates that the investigated compound exhibits a semiconductor behavior. The material reveals a dielectric transition and the experimental results are well fitted by Curie-Weiss law. The magnetic measurements show a clear paramagnetic–ferromagnetic transition with a large magnetic entropy change over a wide range of temperature. Furthermore, Banerjee's criteria and Landau theory of phase transitions are also studied to access magnetic ordering in the sample. A maximum magnetic entropy change increases from 0.5 to 2.18Jkg−1K−1 when magnetic field rises from 1T to 5T. For the higher applied magnetic field, the material exhibits a high relative cooling power RCP=268.14J/kg with a large temperature full-width at half maximum δTFWHM=123K.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2016.09.069