Magneto-electric properties and magnetic entropy change in perovskite La0.7Sr0.3Mn1−xTixO3

• Electro-magnetic properties and CME of La0.7Sr0.3Mn1-xTixO3 have been investigated.
• TC declines and the width of the F-M phase transition is observed as increasing Ti concentration.
• For fully replacing Ti4+ for Mn4+, the canted spin state is formed.
• The substitution Ti for Mn increases resistivity quickly and TP shifts toward lower temperature.
• The substitution Ti shifts CME to 300 K while almost persists the value of entropy change.
• Relative cooling power (RCP) increases with substitution 5% Ti for Mn.

The ceramic samples of La0.7Sr0.3Mn1−xTixO3(x=0; 0.05; 0.1; 0.2 and 0.3) were synthesized by the conventional solid state reaction method. Their electric, magnetic and magnetocaloric properties have been investigated. The transition temperature declines and a significant influence on the width of the ferro-paramagnetic phase transition is observed as increasing Ti concentration. Moreover, the sign of spin-glass is expected to exist in the high concentration samples. For fully replacing Ti4+ for Mn4+, the canted spin state is formed. The substitution Ti for Mn increases resistivity quickly and the insulating–metallic transition temperature shifts toward lower temperature. For x>0.1 samples, the insulating state is observed even in ferromagnetic phase. The substitution Ti shifts the CME to room temperature while almost persists the value of entropy change. Although the maximum value of CME reduces slightly, the temperature range happening MCE is expended and then improves the relative cooling power. These properties could be explained in term of DE interaction and phase separation phenomenon.