Thermal diffusivity measurement of YBa2Cu3O7−x thin film with a picosecond thermoreflectance technique

The thermal diffusivity of YBa2Cu3O7−x (YBCO) film was measured using the optical pump–probe method. A theoretical finite-difference model was employed to calculate the diffusivity value, and the best fit for the c-axis oriented YBCO film showed an average thermal diffusivity of 0.25 ± 0.05 mm2 s−1. The obtained result is compared to previous reports measured using various methods.