Glass-like two-level systems in minimally disordered mixed crystals

A. I. Ryskin; A. J. Sievers; B. E. Hubbard; D. I. Klimenchenko; J. A. Campbell; J. P. Wrubel; N. I. Agladze; P. P. Fedorov

arxiv: cond-mat/0511479 · v2 · submitted 2005-11-18 · ❄️ cond-mat.dis-nn

Glass-like two-level systems in minimally disordered mixed crystals

J. P. Wrubel , B. E. Hubbard , N. I. Agladze , A. J. Sievers , P. P. Fedorov , D. I. Klimenchenko , A. I. Ryskin , J. A. Campbell This is my paper

classification ❄️ cond-mat.dis-nn

keywords systemstwo-levelconcentrationdisordereddistributionminimallymixedbegins

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THz spectroscopy is used to identify a broad distribution of two-level systems, characteristic of glasses, in the substitutional monatomic mixed crystal systems, Ba_{1-x}Ca_xF_2 and Pb_{1-x}Ca_xF_2. In these minimally disordered systems, two-level behavior begins at a specific CaF_2 concentration. The concentration dependence, successfully modeled using the statistics of the impurity distribution in the lattice, points to a collective dopant tunneling mechanism.

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Glass-like two-level systems in minimally disordered mixed crystals

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