Thermal conductivity of high temperature superconductor substrate materials: Lanthanum aluminate and neodymium aluminate

The thermal conductivities of LaAlO₃ and NdAlO₃ have been measured for the first time between 10 and 300 K. These substrates can be classified as intermediate thermal conductors. The measured room temperature values of 9 W m⁻¹ K⁻¹ for LaAlO₃ and 7.5 W m⁻¹ K⁻¹ for NdAlO₃ are close to those predicted from the crystal structure of these materials, despite the fact that the crystals are twinned.