Low-Temperature Thermal Conductivity and Specific Heat of Plastically Deformed High-Purity Tantalum Single Crystals

摘要: The thermal conductivity and the specific heat of plastically deformed, high-purity tantalum single crystals have been measured together with an amorphous SiO2 specimen in temperature range between 50 mK about 2 K. After plastic deformation, was reduced by a factor more than 100 had magnitude comparable to that specimen. However, measurements revealed T3-relationship for phonon contribution down lowest temperatures as case undeformed crystalline solids. Thus, it must be concluded scattering phonons introduced deformation has attributed intrinsic properties dislocations rather interaction tunneling systems. In present paper mechanism is related oscillations geometrical kinks non-screw dislocations.