Rebari, S. and Kumar, Shelender and Indrajeet, S. and Kumar, Abhishek and Pal, Satyendra P. and Weiss, D. and Venkatesan, A. (2017) Tunable low-temperature dissipation scenarios in palladium nanomechanical resonators. PHYSICAL REVIEW B, 95 (21): 214113. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
We study dissipation in palladium (Pd) nanomechanical resonators at low temperatures in the linear response regime. Metallic resonators have shown characteristic features of dissipation due to tunneling two-level systems (TLS). The system described here 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 behavior. We find a sublinear similar to T-0.4 dependence of dissipation in a limited temperature regime. As seen in TLS dissipation scenarios, we find a logarithmic increase of frequency from the lowest temperatures till a characteristic temperature T-co is reached. In samples without H-2, T-co similar to 1K was seen, whereas with H-2 it is clearly reduced to similar to 700 mK. Based on standard TLS phenomena, we attribute this to enhanced phonon-TLS coupling in samples with compressive strain. We also find that 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MECHANICAL RESONATOR; TUNNELING MODEL; 2-LEVEL SYSTEMS; GROUND-STATE; GLASSES; FRICTION; MOTION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:10 |
| Last Modified: | 27 Feb 2019 11:28 |
| URI: | https://pred.uni-regensburg.de/id/eprint/686 |
Actions (login required)
 |
View Item |
