Detecting hydrodynamic fingerprints in the flow of electrons in solids constitutes a dynamic field of investigation in contemporary condensed matter physics. Most attention has been focused on the regime near the degeneracy temperature when the thermal velocity can present a spatially modulated profile. Here, we report on the observation of a hydrodynamic feature in the flow of quasi-ballistic degenerate electrons in bulk antimony. By scrutinizing the temperature dependence of thermal and electric resistivities, we detect a size-dependent departure from the Wiedemann-Franz law, unexpected in the momentum-relaxing picture of transport. This observation finds a natural explanation in the hydrodynamic picture, where upon warming, momentum-conserving collisions reduce quadratically in temperature both viscosity and thermal diffusivity. This effect has been established theoretically and experimentally in normal-state liquid He. The comparison of electrons in antimony and fermions in He paves the way to a quantification of momentum-conserving fermion-fermion collision rate in different Fermi liquids.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7794374 | PMC |
| http://dx.doi.org/10.1038/s41467-020-20420-9 | DOI Listing |
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