• Mohapatra, J.
• Mishra, S. R.
• Azim, Farhan
• Liu, J. P.

Abstract

<jats:title>Abstract</jats:title><jats:p>This study reports the magnetic and magnetocaloric properties of different concentrations of alkaline earth metal, such as Ca-doped La<jats:sub>0.97−<jats:italic>x</jats:italic></jats:sub>Ca<jats:sub><jats:italic>x</jats:italic></jats:sub>Ho<jats:sub>0.03</jats:sub>MnO<jats:sub>3</jats:sub> (<jats:italic>x</jats:italic> = 0.3, 0.33, and 0.37) composites, which were synthesized via autocombustion technique. The second-order paramagnetic-to-ferromagnetic phase transition temperature appeared at the temperature-dependent field-cooled magnetization curve. The result shows an increase in the Curie temperature of the compound with Ca<jats:sup>2+</jats:sup> doping. In addition, increasing the Ca<jats:sup>2+</jats:sup> doping concentration further increased the change in magnetic entropy, − ∆<jats:italic>S</jats:italic><jats:sub><jats:italic>M</jats:italic></jats:sub>, up to 0.206 J kg<jats:sup>−1</jats:sup> K<jats:sup>−1</jats:sup>, resulting in a higher RCP value up to 30 J kg<jats:sup>−1</jats:sup> at <jats:italic>x</jats:italic> = 0.37. This work’s key aspect is demonstrating the potentiality of enhancing the magnetocaloric effect in the framework via the spin coupling mechanism of Ca<jats:sup>2+</jats:sup>-doped rare-earth perovskite compounds.</jats:p><jats:p><jats:bold>Graphical abstract</jats:bold></jats:p>

Topics

• perovskite
• impedance spectroscopy
• compound
• phase
• composite
• phase transition
• Calcium
• magnetization
• Curie temperature