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The magnetic and magnetocaloric properties of polycrystallineLa0.70(Ca0.30-xSrx)MnO3:Ag 10% manganite have been investigated. All thecompositions are crystallized in single phase orthorhombic Pbnm space group.Both, the Insulator-Metal transition temperature (TIM) and Curie temperature(Tc) are observed at 298 K for x = 0.10 composition. Though both TIM and Tc arenearly unchanged with Ag addition, the MR is slightly improved. The MR at 300 Kis found to be as large as 31% with magnetic field change of 1Tesla, whereas itreaches up to 49% at magnetic field of 3Tesla for La0.70Ca0.20Sr0.10MnO3:Ag0.10sample. The maximum entropy change (\DeltaSMmax) is 7.6 J.Kg-1.K-1 upon themagnetic field change of 5Tesla, near its Tc (300.5 K). TheLa0.70Ca0.20Sr0.10MnO3:Ag0.10 sample having good MR (31%1Tesla, 49%3Tesla) andreasonable change in magnetic entropy (7.6 J.Kg-1.K-1, 5 Tesla) at 300 K can bea potential magnetic refrigerant material at ambient temperatures.

Room temperature magnetic entropy change and magnetoresistance in La_{0.70}(Ca_{0.30-x}Sr_x)MnO_3:Ag 10% (x = 0.0-0.10)