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VOLUME 49 (1989) | ISSUE 12 | PAGE 680
Energy localization and propagation in disordered media: low-temperature thermal conductivity of amorphous materials
The model of two-level systems with an interaction U(R)~R~a is used to show that delocalized collective excitations exist in disordered media for a < 6. The low-temperature thermal conductivity resulting from these excitations is calculated. The behavior /с~ Т4/3 is found for a = 3.