Influence of Charge Doping on Thermal Diffusivity of Double Perovskite Sr2FeMoO6 Studied by Mirage Effect

Effects of charge doping on thermal diffusivity have been investigated in double perovskite ferromagnetic Sr2−xLaxFeMoO6 (0 x 0.4) by means of the mirage effect at 300K ( the critical temperature Tc ∼420 K). Substitution of the La3+ ions for the Sr2+ ions significantly increases the value of the thermal diffusivity from 0.39 cm2 · s−1 at x=0 to 0.54 cm2 · s−1 at x=0.4. The increased thermal diffusivity is ascribed to the extra itinerant electrons on the Mo4d↓ band.