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Temperature-Dependent Nonlinear Damping in Palladium Nanomechanical Resonators
Shelender Kumar1, Shishram Rebari1, Satyendra Prakash Pal1
1Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector 81, SAS Nagar, Manauli, P.O. 140306, India.
Researchers observed cubic nonlinear damping in palladium nanomechanical resonators at ultralow temperatures. This temperature-dependent nonlinear damping, highest near 110 mK, offers new avenues for engineering low-temperature nonlinear phenomena.
Area of Science:
- Nanotechnology
- Materials Science
- Condensed Matter Physics
Background:
- Nanofabrication advances enable studies of nonlinear damping in nanomechanical systems.
- Nonlinear phenomena in nanomechanical resonators are crucial for advanced applications.
Purpose of the Study:
- To investigate cubic nonlinear damping in palladium nanomechanical resonators.
- To explore the temperature dependence of nonlinear damping at ultralow temperatures.
Main Methods:
- Fabrication of nanoscale palladium beams.
- Exposure to H2 atmosphere.
- Measurement of damping phenomena at ultralow temperatures (∼110 mK to ∼1 K).
Main Results:
- Observed cubic nonlinear damping in palladium nanomechanical resonators.
- Palladium beams softened and showed enhanced Duffing nonlinearity in H2 atmosphere.
- Damping was highest at ∼110 mK and decreased upon warming to ∼1 K.
- Demonstrated temperature-dependent nonlinear damping below 1 K.
Conclusions:
- Experimental findings align with a two-phonon-mediated nonlinear Akhiezer scenario.
- Ballistic phonon mean free path is comparable to the beam thickness.
- Opens new possibilities for engineering nonlinear phenomena at low temperatures.
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