THERMAL-CONDUCTIVITY OF SRTIO3 THIN-FILMS

The thermal conductivity of pulsed laser deposited SrTiO3 thin films i s measured in the temperature range 30-400 K using the 3 omega method. The room temperature thermal conductivity of the films are more than twice smaller than that of SrTiO3 bulk crystal. At low temperatures, t he film thermal conductivity behaves much like amorphous bulks. We obs erve that the film thermal conductivity is closely related to the depo sition temperature; higher the deposition temperature, larger the film conductivity. Around 200 K, a weak maximum was observed for coarse gr ained films. The measured film thermal conductivity values are well ab ove the expected minimum.