Glasslike two-level systems in minimally disordered mixed crystals

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(x)F(2) and Pb(1-x)Ca(x)F(2). In these minimally disordered systems, two-level behavior, which was not previously known to occur,...

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Bibliographic Details
Published in:Physical review letters 2006-06, Vol.96 (23), p.235503-235503, Article 235503
Main Authors: Wrubel, J P, Hubbard, B E, Agladze, N I, Sievers, A J, Fedorov, P P, Klimenchenko, D I, Ryskin, A I, Campbell, J A
Format: Article
Language:English
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Summary: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(x)F(2) and Pb(1-x)Ca(x)F(2). In these minimally disordered systems, two-level behavior, which was not previously known to occur, 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.96.235503