Magnetic entropy change; Magnetocaloric effect; Manganite; Relative cooling power Calcium; Cooling; Entropy; Lanthanum compounds; Manganese oxide; Manganites; Meteorology; Rietveld refinement; Single crystals; Solid state reactions; Temperature distribution; X ray diffraction; Magnetic entropy change; Magnetic refrigerants; Near room temperature; Orthorhombic structures; Relative cooling power; Solid state reaction method; Structural and magnetic properties; Temperature dependence; Magnetocaloric effects