Thermal diffusivity of double perovskite Sr2MMoO6 (M=Fe, Mn and Co) and La doping effects studied by mirage effect Original Research Article

The thermal diffusivity has been investigated in double perovskite Sr2MMoO6 (M=Fe, Mn and Co) by means of the mirage effect. We have found that the thermal diffusivity of metallic Sr2FeMoO6 is 0.39 cm2/s, which is larger than that (0.33 cm2/s) of insulating Sr2MnMoO6 and Sr2CoMoO6. We further investigate the substitution effects of the La3+ ions for the Sr2+ ions in Sr2FeMoO6 and Sr2MnMoO6, and have found that the thermal diffusivities of both samples significantly increase with the La concentration. Such an enhancement of the thermal diffusivities has been ascribed to occupation of the extra itinerant electrons on the conduction Mo4d band.