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

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

2005-11-18

arxiv.org/abs/cond-mat/0511479v2

Phys. Rev. Lett. 96, 235503 (2006)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures, 2 tables, submitted to Phys. Rev. Lett v.2: fixed typo in authors list, no text changes

Scientific paper

10.1103/PhysRevLett.96.235503

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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