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- W3098622664 abstract "The bias energies of various two-level systems (TLSs) and their strengths of interactions with the strain are calculated for Ar:N$_2$ glass. Unlike the case in KBr:CN, a distinct class of TLSs having weak interaction with the strain and untypically small bias energies is not found. The addition of CO molecules introduces CO flips which form such a class of weakly interacting TLSs, albeit at much lower coupling than are typically observed in solids. We conclude that because of the absence of a distinct class of weakly interacting TLSs, Ar:N$_2$ is a non-universal glass, the first such system in three dimensions and in ambient pressure. Our results further suggest that Ar:N$_2$:CO may show universal properties, but at temperatures lower than $approx 0.1$ K, much smaller than typical temperature $approx 3$ K associated with universality, because of the untypical softness of this system. Our results thus shed light on two long standing questions regarding low temperature properties of glasses: the necessary and sufficient conditions for quantitative universality of phonon attenuation, and what dictates the energy scale of $approx 3$ K below which universality it typically observed." @default.
- W3098622664 created "2020-11-23" @default.
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- W3098622664 date "2015-03-01" @default.
- W3098622664 modified "2023-09-27" @default.
- W3098622664 title "Inversion symmetric vs. asymmetric excitations and the low-temperature universal properties of Ar:N 2 and Ar:N 2 :CO glasses" @default.
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- W3098622664 doi "https://doi.org/10.1209/0295-5075/109/56001" @default.
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