Abstract
We study the thermal conductivity of isotope-controlled diamond thin films between 0.001% and 99% 13C contents using an ultrafast pump-probe laser experiment. We measure the surface temperature change through the reflectivity change of the probe light pulse after heating with the pump light pulse, compare it with a theoretical calculation, and estimate the thermal conductivity. The Brillouin-oscillation appears in the reflectivity change, which is used for determining the film thickness and then removed in determining the thermal conductivity. The theoretical calculation reveals that the diamond film should be thicker than 1 μm for obtaining appropriate thermal conductivity. Our results indicate that the thermal conductivity of the 50%-13C diamond thin film is much lower than the reported value, suggesting unavailability of reported values of bulk materials for thin films and necessity for measurement for the thermal conductivity of thin films.
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