Evidence for hydrodynamic electron flow in PdCoO2

Philip J.W. Moll, Pallavi Kushwaha, Nabhamila Nandi, Burkhard Schmidt, Andrew Mackenzie

Research output: Contribution to journalArticlepeer-review

203 Citations (Scopus)


Electron transport is conventionally determined by the momentum-relaxing scattering of electrons by the host solid and its excitations. Hydrodynamic fluid flow through channels, in contrast, is determined partly by the viscosity of the fluid, which is governed by momentum-conserving internal collisions. A long-standing question in the physics of solids has been whether the viscosity of the electron fluid plays an observable role in determining the resistance. We report experimental evidence that the resistance of restricted channels of the ultrapure two-dimensional metal palladium coboltate (PdCoO2) has a large viscous contribution. Comparison with theory allows an estimate of the electronic viscosity in the range between 6×10–3 kg(ms)–1 and 3×10–4 kg(ms)–1, versus 1×10–3 kg(ms)–1 for water at room temperature.
Original languageEnglish
Pages (from-to)1061-1064
Number of pages5
Issue number6277
Early online date11 Feb 2016
Publication statusPublished - 4 Mar 2016


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