Thermal diffusivity of La0.6Sr0.4MnO3 film investigated by transient thermal grating technique

摘要

We investigate thermal diffusivity a of La0.6Sr0.4MnO3 thin film by means of transient thermal grating technique. The transient thermal grating signal is analysised by Green's functions, and the thermal diffusivity a of La0.6Sr0.4MnO3 film is determined to be 0.92 mm(2)s(-1). Comparison with that (similar to 1 mm(2)s(-1)) of the ceramic material, the smaller a-value is ascribed to the mismatch of lattice for the film material.