LOW-TEMPERATURE TRANSPORT-PROPERTIES OF P-TYPE COSB3

Single crystals of the skutterudite CoSb3 exhibit large hole mobilities (up to 3000 cm2 V-1 s-1 at room temperature), intrinsic lattice thermal conductivity down to 10 K, and pronounced phonon drag effects in the thermoelectric power. The dependence of the mobility and diffusion thermopower on hole density is consistent with recent band-structure calculations, which indicate that CoSb3 possesses a highly nonparabolic valence-band structure. © 1995 The American Physical Society.