Thermal and electronic transport in La0.7Sr0.3−xAgxMnO3 compounds between 50 and 450 K

Temperature dependence of electrical and thermal conductivity of nanocrystalline La0.7Sr0.3−xAgxMnO3 (x=0.05x=0.05, 0.10, 0.20, 0.25) pellets prepared by pyrophoric method is reported between 20 and 300 K. Silver doping in LSMO influences strongly both the electrical and thermal conductivity. The metal–insulator transition temperature shows significant enhancement from 303 K (x=0.05) to 363 K (x=0.25). Electrical conduction in La0.7Sr0.3−xAgxMnO3 above TC is consistent with adiabatic small polaron hopping, while, in the ferromagnetic region (T