Low temperature acoustic properties of amorphous silica and the Tunneling Model

Details Low temperature acoustic properties of amorphous silica and the Tunneling Model Low temperature acoustic properties of amorphous silica and the Tunneling Model

1999-12-10

arxiv.org/abs/cond-mat/9912191v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

1 tex file, 6 figures

Scientific paper

10.1103/PhysRevLett.84.4601

Internal friction and speed of sound of a-SiO(2) was measured above 6 mK using a torsional oscillator at 90 kHz, controlling for thermal decoupling, non-linear effects, and clamping losses. Strain amplitudes e(A) = 10^{-8} mark the transition between the linear and non-linear regime. In the linear regime, excellent agreement with the Tunneling Model was observed for both the internal friction and speed of sound, with a cut-off energy of E(min) = 6.6 mK. In the non-linear regime, two different behaviors were observed. Above 10 mK the behavior was typical for non-linear harmonic oscillators, while below 10 mK a different behavior was found. Its origin is not understood.

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