低温下多组分玻璃中双组分隧穿机制的直接证据
Direct Evidence for a Two-component Tunnelling Mechanism in the Multicomponent Glasses at Low Temperatures
摘要：
用二能级系统隧穿模型（TM）较成功地解释了低温（$T<$ 1 K）下窗口玻璃的介电反常现象。然而，最近在多硅酸盐玻璃\cite{ref1} - \cite{ref3}中发现的磁效应，以及来自混合的（SiO $_2$）$_{1-x}$（K $_2$ O）$_x$和（SiO $_2$）$_{1-x}$（Na $_2$ O）$_x$玻璃\cite{ref4}的一些较旧的数据，表明需要适当地推广2LS TM。我们表明，不仅为磁效应\cite{ref3,ref5}，但也为混合玻璃中没有一个字段，提供了正确的扩展的2LS TM的（异常）多级隧道系统的方法，我们之一。在混合玻璃中，新的2LS通过稀释作用在SiO $_4$ -掺杂团簇的壳附近形成。
英文摘要：
The dielectric anomalies of window-type glasses at low temperatures ($T<$ 1 K) are rather successfully explained by the two-level systems (2LS) tunneling model (TM). However, the magnetic effects discovered in the multisilicate glasses in recent times \cite{ref1}-\cite{ref3}, and also some older data from mixed (SiO$_2$)$_{1-x}$(K$_2$O)$_x$ and (SiO$_2$)$_{1-x}$(Na$_2$O)$_x$ glasses \cite{ref4}, indicate the need for a suitable generalization of the 2LS TM. We show that, not only for the magnetic effects \cite{ref3,ref5} but also for the mixed glasses in the absence of a field, the right extension of the 2LS TM is provided by the (anomalous) multilevel tunneling systems approach proposed by one of us. It appears that new 2LS develop via dilution near the hull of the SiO$_4$-percolating clusters in the mixed glasses.
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