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We report electrical resistivity, magnetic and magnetocaloric properties inSm0.7-xLaxSr0.3MnO3 series for x= 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.65, and0.7. All the compounds show second order paramagnetic to ferromagnetictransition at T = Tc which is tunable anywhere between 83 K and 373 K with aproper choice of the doping level (x). The insulating ferromagnet x= 0transforms to ferromagnetic metal below Tc for x= 0.1 and the insulator-metaltransition temperature shifts up with increasing x. The magnetization (M)exhibits an interesting behavior as a function of temperature and doping level.The field-cooled M(T) of all but x= 0.7 compound show a cusp at a temperatureT* much below Tc. While the Tc increases monotonically with increasing x, T*increases gradually, attains a maximum value (T*= 137 K) for x= 0.6 anddecreases rapidly thereafter. It is suggested that the decrease of M(T) belowT* is due to ferrimagnetic interaction between Sm(4f) and Mn(3d) sublatticesthat promotes spin-reorientation transition of the Mn-sublattice. The observedanomalous feature in M(T) does not have impact on the dc resistivity. Magneticentropy change (delta Sm) was estimated from magnetization isotherms. The signof delta Sm is found to change from negative above T* to positive below T*indicating the coexistence of normal and inverse magnetocaloric effects. deltaSm is nearly composition independent (-delta Sm is about 1.5 J/Kg K for delta H= 1 Tesla) and refrigeration capacity lies between 50 and 80 J/kg K for x =0.1-0.6. The tunability of Curie temperature with a nearly constant delta Smvalue along with high refrigeration capacity makes this series of compoundsinteresting for magnetic refrigeration over a wide temperature range.

Tunable spin reorientation transition and magnetocaloric effect in Sm0.7-xLaxSr0.3MnO3 series