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arXiv · 1608.01871

Mechanical dissipation in MoRe superconducting metal drums

S. Yanai·V. Singh·M. Yuan·M. Gely·S. J. Bosman·G. A. Steele
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Abstract

We experimentally investigate dissipation in mechanical resonators made of a disordered superconducting thin film of Molybdenum-Rhenium(MoRe) alloy. By electrostatically driving the drum with a resonant AC voltage, we detect its motion using a superconducting microwave cavity. From the temperature dependence of mechanical resonance frequencies and quality factors, we find evidence for non-resonant, mechanically active two-level systems (TLSs) limiting its quality factor at low temperature. In addition, we observe a strong suppression of mechanical dissipation at large mechanical driving amplitudes, suggesting an unconventional saturation of the non-resonant TLSs. These new observations shed light on the mechanism of mechanical damping in superconducting drums and routes towards understanding dissipation in such mechanical systems.

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S. Yanai, V. Singh, M. Yuan, M. Gely, S. J. Bosman, G. A. Steele. 2016-08-05. Mechanical dissipation in MoRe superconducting metal drums. https://doi.org/10.1063/1.4976831

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