Low temperature thermal properties of vitreous silica and plastically deformed pure aluminium

The thermal conductivity, heat capacity and heat release of vitreous silica and pure plastically deformed aluminium were investigated. The temperature dependence and absolute value of the lattice thermal conductivity of both materials are very similar. However, in contrast to vitreous silica neither long-time heat release nor additional contribution to the heat capacity expected for tunnelling systems was found for aluminium.