Structural properties, electrical behavior and estimation of the magnetocaloric effect in La0.6Sr0.4Mn0.9V0.1O3 compound from resistivity and phenomenological model

An investigation of structural, electrical properties and magnetic entropy of La0.6Sr0.4Mn0.9V0.1O3 is presented. Rietveld refinement of X-ray diffraction patterns indicates a rhombohedral structure with space group R3¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\bar 3$$\end{document}c for La0.6Sr0.4Mn0.9V0.1O3 sample. The dependence of magnetization on the variation of temperature for La0.6Sr0.4Mn0.9V0.1O3 perovskite-type ceramic materials under an external magnetic field was modelled using a phenomenological model. The magnetocaloric properties of the polycrystalline manganite La0.6Sr0.4Mn0.9V0.1O3 based on resistivity measurements was investigated using, the equation ΔS=-α∫0H∂Ln(ρ)∂T)HdH\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta S= - \alpha \int\limits_0^H {\frac{{\partial Ln(\rho )}}{{\partial T}}} {)_H}dH$$\end{document} relates magnetic order to the transport behavior of the compound. The theoretical predictions of the magnetic entropy change (ΔSM\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta {S_M}$$\end{document}) nearly match with the estimation of the ΔSM\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta {S_M}$$\end{document} from resistivity analysis. Moreover, La0.6Sr0.4Mn0.9V0.1O3 sample shows a large magnetoresistance effect (35% at 5T field).