Metal-nonmetal transition in LixCoO2 thin film and thermopower enhancement at high Li concentration

Abstract

We investigate the transport properties of LixCoO2 thin films whose resistivities are nearly an order of magnitude lower than those of the bulk polycrystals. A metal-nonmetal transition occurs at ~0.8 in a biphasic domain, and the Seebeck coefficient (S) is drastically increased at ~140 K (= T*) with increasing the Li concentration to show a peak of magnitude ~120 \muV/K in the S-T curve of x = 0.87. We show that T* corresponds to a crossover temperature in the conduction, most likely reflecting the correlation-induced temperature dependence in the low-energy excitations.

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Cited by in corpus (5)

• Impact of lithium composition on the thermoelectric properties of the layered cobalt oxide system LixCoO2
• Ultrathin 2D-oxides: a perspective on fabrication, structure, defect, transport, electron and phonon properties
• Electronic phase diagram of LixCoO2 revisited with potentiostatically de-intercalated single crystals
• Novel electronic states realized by the interplay between Li diffusion and Co${}^{3+}$$/$Co${}^{4+}$ charge ordering in Li${}_{\mathrm{x}}$CoO${}_2$
• Thermoelectric response across the semiconductor-semimetal transition in black phosphorus