J. Phys. IV France 125 (2005) 253-255
Thermal diffusivity of double perovskite Sr2FeMoO6 up to 450 KX.J. Liu, Q.J. Huang, A.H. Luo, D.L. Niu and S.Y. Zhang
State Key Lab. of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, China
Thermal diffusivity has been investigated in double perovskite Sr2FeMoO6 by means of transient surface grating in the temperature range of 300-450 K. The thermal diffusivity shows an appreciable decrease from 0.39 cm2/s at 300 K to 0.37 cm2/s at 360 K in the ferromagnetic phase, and then immediately decreases to 0.1 cm2/s with further increasing temperature above the critical temperature Tc~380 K. Such an abruptly decrease of the thermal diffusivity has been ascribed to the structure change and hence the spin order-disorder transition.
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