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We study dissipation in Pd nano-mechanical resonators at low temperatures inthe linear response regime. Metallic resonators have shown characteristicfeatures of dissipation due to tunneling two level systems (TLS). This systemoffers a unique tunability of the dissipation scenario by adsorbing hydrogen($H_2$) which induces a compressive stress. The intrinsic stress is expected toalter TLS behaviour. We find a sub-linear power law $\sim T^{0.4}$ indissipation. As seen in TLS dissipation scenarios we find a logarithmicincrease of frequency characteristic from the lowest temperatures till acharacteristic 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-TLScoupling in samples with compressive strain. We also find with $H_2$ there is asaturation in low temperature dissipation which may possibly be due tosuper-radiant interaction between TLS and phonons. We discuss the data in thescope of TLS phenomena and similar data for other systems.

Low temperature dissipation scenarios in palladium nano-mechanical resonators