  We present thermal conductivity measurements performed in three short-period
(GaAs)_9(AlAs)_5 superlattices. The samples were grown at different
temperatures, leading to different small scale roughness and broadening of the
interfaces. The cross-plane conductivity is measured with a differential 3w
method, at room temperature. The order of magnitude of the overall thermal
conductivity variation is consistent with existing theoretical models, although
the actual variation is smaller than expected.

Materials Science