Structural and transport properties of epitaxial NaxCoO2 thin films

Abstract

We have studied structural and transport properties of epitaxial NaxCoO2 thin films on (0001) sapphire substrate prepared by topotaxially converting an epitaxial Co3O4 film to NaxCoO2 with annealing in Na vapor. The films are c axis oriented and in-plane aligned with [10 1 0] NaxCoO2 rotated by 30 degrees from [10 1 0] sapphire. Different Na vapor pressures during the annealing resulted in films with different Na concentrations, which showed distinct transport properties.

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• Charge-ordering, commensurability and metallicity in the phase diagram of layered Na(x)CoO(2)
• Dome-shaped magnetic phase diagram of thermoelectric layered cobaltites
• The Fermi surface of Na${}_x$CoO${}_2$
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Cited by in corpus (1)

• Fabrication and Low Temperature Thermoelectric Properties of Na_xCoO_2 (x = 0.68 and 0.75) Epitaxial Films by the Reactive Solid-Phase Epitaxy