Glass-like two-level systems in minimally disordered mixed crystals
Disordered Systems and Neural Networks
2007-11-13 v2
Abstract
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.
Cite
@article{arxiv.cond-mat/0511479,
title = {Glass-like two-level systems in minimally disordered mixed crystals},
author = {J. P. Wrubel and B. E. Hubbard and N. I. Agladze and A. J. Sievers and P. P. Fedorov and D. I. Klimenchenko and A. I. Ryskin and J. A. Campbell},
journal= {arXiv preprint arXiv:cond-mat/0511479},
year = {2007}
}
Comments
4 pages, 4 figures, 2 tables, submitted to Phys. Rev. Lett v.2: fixed typo in authors list, no text changes