Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 162, Issue 5-6, Pages 500-508Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-010-0320-2
Keywords
Solid helium; Supersolid; Glass; Torsion oscillator
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Funding
- LDRD through the US Dept. of Energy at Los Alamos National Laboratory [DE-AC52-06NA25396]
- Center for Materials Innovation (CMI) of Washington University, St. Louis
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Single and double torsion oscillators have been used to measure the anomalous change in resonant frequency and accompanying dissipation in solid He-4. We present a glass description of the mechanical anomalies found in torsion oscillator measurements. Our results show that it is not necessary to invoke a supersolid interpretation to explain these mechanical anomalies. Previously, we demonstrated that the back-action of a glassy subsystem present in solid He-4 can account for frequency change and dissipation peak in single torsion oscillator experiments. Here, we show that the same glassy back-action can explain the experimental results of the composite torsion oscillator developed by the Rutgers group, which measures the response of solid He-4 at the in-phase mode f (1)=496 Hz and out-of-phase mode f (2)=1173 Hz.
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