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Cobaltites with the general formula ACoO3 exhibit a wide variety of physical properties. Cobaltite Pr0.5Ca0.5CoO3 exhibits a metal–insulator transition accompanied by a structural shift with a delocalized intermediate spin state (t2g5eg1\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$t_{2g}^{5} e_{g}^{1}$$\end{document}) or S∗\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$S^{*}$$\end{document} at high temperature. In this work, Pr0.5−xSmxCa0.5CoO3−δ (x = 0.02, 0.04, 0.06, and 0.08) perovskites were synthesized by the standard solid-state method. Rietveld analysis for experimental X-ray diffraction (XRD) patterns showed that the samples crystallize in an orthorhombic structure with space group Pnma (62). Zero field cooling-field cooling (ZFC–FC) magnetization curves, at a temperature range from 50 to 300 K, show paramagnetic behaviors in each of the Sm doped samples. The analysis of magnetization curves suggests that the samples exhibit a short-range ferromagnetic phase at 50 K and a Co low spin (LS) state in the paramagnetic regime.
Journal of Low Temperature Physics – Springer Journals
Published: Mar 16, 2021
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