Abstract
This investigation is interested in studying the relation between magnetocaloric effect and transport properties i La0.8Ca0.2MnO3 manganite compound. The value of the magnetocaloric effect has been determined from the calculation of magnetization as a function of temperature under different external magnetic fields. This study also provides an alternative method to determine the magnetocaloric properties such as magnetic entropy change and heat capacity change on the basis of M(T, H) measurements. On the other hand, based on magnetic and resistivity measurements, the magnetocaloric properties of this compound were investigated using an equation of the form {Delta } S ,=, - alpha {int limits _{0}^{H}} {left [ {frac {delta Lnleft (rho right )}{delta T}} right ]}_{H} dH, which relates magnetic order to transport behavior of the compounds. As an important result, the values of MCE and the results of calculation are in good agreement with the experimental ones, which indicates the strong correlation between the electric and magnetic properties in manganites.
Highlights
The theoretical and experimental studies of the magnetic materials with large magnetocaloric effect (MCE) have been the interest of many researchers thanks to their great potential applications in energy-efficient magnetic refrigeration (MR) technology [1,2,3]
As for the second one, it relates to the fact that magnetic refrigeration close to room temperature is only possible with materials that undergo a phase transition close to the working temperature of a refrigerator
The characterization of magnetocaloric materials commonly tends to become linked to a comprehensive study of their phase transition, which is important from a fundamental standpoint
Summary
The theoretical and experimental studies of the magnetic materials with large magnetocaloric effect (MCE) have been the interest of many researchers thanks to their great potential applications in energy-efficient magnetic refrigeration (MR) technology [1,2,3]. Many magnetocaloric materials have been thoroughly investigated over the past years due to their possible application in magnetic refrigeration near room temperature region, e.g., Gd5Si2Ge2 alloy [4], NiMnGa [5], MnFeP1−xAsx [6], LaFe13−xSix [7], and ferromagnetic perovskite manganites [8,9,10]. The present research is a theoretical work that undertakes the study of the effect of quenching on the correlation between the electrical and magnetic properties of the La0.8Ca0.2MnO3 polycrystalline
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