Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1810422 | Physica B: Condensed Matter | 2013 | 6 Pages |
Abstract
The La0.6Ca0.4âxSrxMnO3 (x=0, 0.2 and 0.4) samples have been elaborated by the solid-state method. X-ray powder diffraction shows that, for x=0, the sample crystallizes in orthorhombic phase, while, for xâ¥0.2 the structure becomes rhombohedral. The variation of magnetization as a function of temperature and applied magnetic field were carried out. All samples exhibit a PM-FM transition at the Curie temperature TC which increases with Sr2+ content. Magnetocaloric effect has been calculated in terms of isothermal magnetic entropy change. A large magnetocaloric effect has been observed in all samples, the maximum entropy change, |ÎSMmax|, reaches the highest value of 6.70 J/kg K under a magnetic field change of 5 T with an RCP value of 285 J/kg for La0.6Ca0.2Sr0.2MnO3 composition, which will be an interesting compound for application materials working as magnetic refrigerants near room temperature. The electrical transport behavior Ï(T) was also investigated. All the specimens undergo a metallic-semiconductor transition at the temperature TÏ. The ÏâT fit well with the phenomenological equation for conductivity under a percolation approach.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
M. Nasri, M. Triki, E. Dhahri, M. Hussein, P. Lachkar, E.K. Hlil,