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Regular version of the site

Article

Thermal Relaxation in Titanium Nanowires: Signatures of Inelastic Electron-Boundary Scattering in Heat Transfer

Journal of Low Temperature Physics. 2017. Vol. 189. P. 204-216.
Temu E., Lahteenmaki P., Golubev D., Savin A., Arutyunov K., Hakonen P.

We have employed noise thermometry for investigations of thermal relaxation
between the electrons and the substrate in nanowires patterned from 40-nm-thick
titanium film on top of silicon wafers covered by a native oxide. By controlling the
electronic temperature Te by Joule heating at the base temperature of a dilution refrigerator,
we probe the electron–phonon coupling and the thermal boundary resistance at
temperatures Te = 0.5–3 K. Using a regular T 5-dependent electron–phonon coupling
of clean metals and a T 4-dependent interfacial heat flow, we deduce a small contribution
for the direct energy transfer from the titanium electrons to the substrate phonons
due to inelastic electron-boundary scattering.