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Updated: Mar 25, 2026

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
Published on: September 7, 2018
Evidence for hydrodynamic electron flow in PdCoO₂
Philip J W Moll1, Pallavi Kushwaha2, Nabhanila Nandi2
1Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland. Department of Physics, University of California, Berkeley, CA 94720, USA. Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
Researchers found that electron fluid viscosity significantly impacts electrical resistance in palladium cobaltate channels. This study provides experimental evidence for viscous effects in electron transport, offering new insights into condensed matter physics.
Area of Science:
- Condensed matter physics
- Solid-state physics
Background:
- Electron transport is typically governed by scattering events.
- Hydrodynamic fluid flow is influenced by viscosity and internal collisions.
Purpose of the Study:
- To investigate if electron fluid viscosity plays an observable role in determining electrical resistance.
- To experimentally verify viscous contributions to resistance in a 2D metal.
Main Methods:
- Experimental measurements of electrical resistance in restricted channels of palladium cobaltate (PdCoO2).
- Comparison of experimental results with theoretical models to estimate electronic viscosity.
Main Results:
- Observed a significant viscous contribution to the electrical resistance of PdCoO2 channels.
- Estimated the electronic viscosity of PdCoO2 to be between 6 × 10(-3) and 3 × 10(-4) kg m(-1) s(-1).
Conclusions:
- Electron fluid viscosity has an observable impact on electrical resistance in confined systems.
- The findings challenge conventional models of electron transport and open new avenues for research in viscous electron hydrodynamics.
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