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arXiv · 1612.07975

Low temperature dissipation scenarios in palladium nano-mechanical resonators

S. Rebari·Shelender Kumar·S. Indrajeet·Abhishek Kumar·Satyendra P. Pal·A. Venkatesan·D. Weiss
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Abstract

We study dissipation in Pd nano-mechanical resonators at low temperatures in the linear response regime. Metallic resonators have shown characteristic features of dissipation due to tunneling two level systems (TLS). This system offers a unique tunability of the dissipation scenario by adsorbing hydrogen ($H_2$) which induces a compressive stress. The intrinsic stress is expected to alter TLS behaviour. We find a sub-linear power law $\sim T^{0.4}$ in dissipation. As seen in TLS dissipation scenarios we find a logarithmic increase of frequency characteristic from the lowest temperatures till a characteristic temperature $T_{co}$ is reached. In samples without $H_2$ the $T_{co} \sim 1K$ whereas with $H_2$ it is clearly reduced to $\sim 700 mK$. Based on standard TLS phenomena we attribute this to enhanced phonon-TLS coupling in samples with compressive strain. We also find with $H_2$ there is a saturation in low temperature dissipation which may possibly be due to super-radiant interaction between TLS and phonons. We discuss the data in the scope of TLS phenomena and similar data for other systems.

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S. Rebari, Shelender Kumar, S. Indrajeet, Abhishek Kumar, Satyendra P. Pal, A. Venkatesan, D. Weiss. 2016-12-23. Low temperature dissipation scenarios in palladium nano-mechanical resonators. https://doi.org/10.1103/physrevb.95.214113

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