Thermal conductivity of AlAs_(0.07)Sb_(0.93) and Al_(0.9)Ga_(0.1)As_(0.07)Sb_(0.93) alloys and (AlAs)_(1)/(AlSb)_(11) digital-alloy superlattices

摘要

A differential 3ω technique is employed to determine the thermal conductivity of the AlAs_(0.07)Sb_(0.93) ternary alloy, the Al_(0.9)Ga_(0.1)As_(0.07)Sb_(0.93) quaternary alloy, and an (AlAs)_(1)/(AlSb)_(11) digital-alloy superlattice. Between 80 and 300 K, the thermal conductivities for all three samples are relatively insensitive to temperature. The thermal conductivity of the (AlAs)_(1)/(AlSb)_(11) superlattice is smaller than that of the AlAs_(0.07)Sb_(0.93) ternary alloy, but much larger than the predictions of a model for phonon transport across the superlattice interfaces.