Abstract
A new type of two-level system (TLS) in glasses is proposed. Coherent tunneling states (CTS) arise when an interaction between atoms which occupy a double-well potential (DP) is taken into account. The DP under consideration has very small (< 100 K) barrier height and for this reason was neglected in earlier TLS models. Now, in the chain of elastically bonded atoms in DP, the phenomenon of specific collective motion called coherent tunneling plays an important role. The tunneling process splits the lowest energy level in such systems and CTS appear in the glass volume. The CTS concentration in glasses is 1018 cm−3, an order of magnitude comparable to an experimentally determined value. Such a concentration of CTS in a sample is enough to explain some experimental results, particularly the difference between logarithmic dependence of heat capacity on the measurement time below 1 K predicted earlier and experimental data.
Published Version
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