Abstract
Rare-earth chromites have been envisioned to replace gas-based refrigeration technology because of their promising magnetocaloric properties at low temperatures, especially in the liquid helium temperature range. Here, we report the low-temperature magnetic and magnetocaloric properties of Gd0.5Er0.5Cr1−xMnxO3 (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) rare-earth orthochromites. The Néel transition temperature (TN) was suppressed from 144 K for Gd0.5Er0.5CrO3 to 66 K for the Gd0.5Er0.5Cr0.5Mn0.5O3 compound. Furthermore, magnetization reversal was observed in the magnetization versus temperature behavior of the Gd0.5Er0.5Cr0.6Mn0.4O3 and Gd0.5Er0.5Cr0.5Mn0.5O3 compounds at 100 Oe applied magnetic field. The magnetic entropy change (−∆S) value varied from 16.74 J/kg-K to 7.46 J/kg-K, whereas the relative cooling power (RCP) ranged from 375.94 J/kg to 220.22 J/kg with a Mn ion concentration at 5 T field and around 7.5 K temperature. The experimental results were substantiated by a theoretical model. The present values of the magnetocaloric effect are higher than those of many undoped chromites, manganites and molecular magnets in the liquid helium temperature range.
Highlights
Researchers have been exploring these materials for their usefulness as a low-temperature refrigerant employing the magnetocaloric effect, which is measured in terms of magnetic entropy change and relative cooling power [10,11,12,13,15,16,17,18,19,20]
The samples were characterized for phase identification using an X-ray diffractometer (XRD; PANalytical-Empyrean, Almelo, The Netherlands) at room temperature using Cu-Kα radiation with wavelength 1.5404 Å at a step of 0.01◦
It is clear from the XRD patterns that there are no impurity peaks in these series of samples and the diffraction peaks are well matched with the pristine GdCrO3 compound (JCPDS Card No 25-1056)
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Exchange bias [5], spin reorientation [6], magnetization reversal [7,8,9] and magnetocaloric effect (MCE) [10,11,12,13]. Researchers have been exploring these materials for their usefulness as a low-temperature refrigerant employing the magnetocaloric effect, which is measured in terms of magnetic entropy change and relative cooling power [10,11,12,13,15,16,17,18,19,20]. It is worthwhile to investigate the magnetic and magnetocaloric properties of Mn-substituted Gd0.5 Er0.5 CrO3 compounds. Compounds and investigated the effect of Mn substitution on the magnetic and magnetocaloric properties.
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