[7a-C22-1~12] 22.1 Joint Session M "Phonon Engineering"

[7a-C22-7] The phonon scattering at the interface of Fe₂VAl/Heavy Metal Superlattice

〇(PC)Satoshi Hiroi^1,2, Seongho Choi², Shunsuke Nishino², Okkyun Seo¹, Tsunehiro Takeuchi² (1.NIMS, 2.Toyota Tech. Inst.)

Keywords:phonon engineering, boundary thermal resistance, thermoelectric materials

We tried to measure the boundary thermal resistance of epitaxial Fe₂VAl/W multilayers to improve the thermoelectric properties by reduction of lattice thermal conductivity. The areal heat diffusion time obtained by the picosecond pulse-light thermoreflectance measurement was rapidly decrease below 10 nm in Fe₂VAl thickness for the W/Fe₂VAl/W three-layered films. This result suggested that there is the mechanism for phonon scattering at the interface depending on the Fe₂VAl thickness below 10 nm.