Influence of cobalt on the structural, magnetic and magnetocaloric properties of La0.67Ca0.33MnO3

► The magnetic results show that the MCE property of LCMO is affected by doping of Co for Mn sites. ► An increase in MR, a decrease of MCE and Curie temperatures are observed with increase in Co doping. ► Relatively large value and broad temperature interval of MCE are observed in LCMCo0.03 compound. ► LCMCo0.03 is found to be a candidate for magnetic refrigerators at sub-room temperatures.