Glasslike 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

doi:10.1103/PhysRevLett.96.235503

Glasslike 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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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-xCa_xF₂ and Pb_1-xCa_xF₂. In these minimally disordered systems, two-level behavior, which was not previously known to occur, begins at a specific CaF₂ concentration. The concentration dependence, successfully modeled using the statistics of the impurity distribution in the lattice, points to a collective dopant tunneling mechanism.

Original language	English
Article number	235503
Number of pages	4
Journal	Physical Review Letters
Volume	96
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.96.235503
Publication status	Published - 16 Jun 2006
Externally published	Yes

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abstract = "THz spectroscopy is used to identify a broad distribution of two-level systems, characteristic of glasses, in the substitutional monatomic mixed crystal systems, Ba1-xCaxF2 and Pb1-xCaxF2. In these minimally disordered systems, two-level behavior, which was not previously known to occur, begins at a specific CaF2 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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AU - Hubbard, B. E.

AU - Agladze, N. I.

AU - Sievers, A. J.

AU - Fedorov, P. P.

AU - Klimenchenko, D. I.

AU - Ryskin, A. I.

AU - Campbell, J. A.

PY - 2006/6/16

Y1 - 2006/6/16

N2 - THz spectroscopy is used to identify a broad distribution of two-level systems, characteristic of glasses, in the substitutional monatomic mixed crystal systems, Ba1-xCaxF2 and Pb1-xCaxF2. In these minimally disordered systems, two-level behavior, which was not previously known to occur, begins at a specific CaF2 concentration. The concentration dependence, successfully modeled using the statistics of the impurity distribution in the lattice, points to a collective dopant tunneling mechanism.

AB - THz spectroscopy is used to identify a broad distribution of two-level systems, characteristic of glasses, in the substitutional monatomic mixed crystal systems, Ba1-xCaxF2 and Pb1-xCaxF2. In these minimally disordered systems, two-level behavior, which was not previously known to occur, begins at a specific CaF2 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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ER -

Glasslike Two-Level Systems in Minimally Disordered Mixed Crystals

Abstract

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