Magnetic, magnetocaloric, and magnetotransport properties of RCo1.8Mn0.2 (R=Er, Ho, Dy, and Tb) compounds

► We study magnetic, and transport properties of RCo1.8Mn0.2 (R=Er, Ho, Dy, and Tb). ► Maximum RCP vary from 467 J/kg at low temperature for R=Er to 202 J/kg at the room temperature for R=Tb. ► TC increases with increase in the metallic radii of R, and the de Gennes factor.