G144 高温超伝導YBCO薄膜熱伝導率の7Tまでの強磁場下測定

Abstract

We have measured the out-of-plane thermal conductivity of YBCO thin film (1.0μm in thickness) in the temperature range from 5 K to 300 K by photothermal reflectance method as preliminary measurement. Measured value exhibits temperature dependence of same tendency as bulk value, but the absolute value is smaller. Subsequently, we have performed measurement under high magnetic field up to 7 T below critical temperature (90 K). By changing the intensity of magnetic field, phase lags of temperature response are changed. This indicates existence of magnetic field dependence of the out-of-plane thermal conductivity for YBCO thin films.