Metal-nonmetal transition in LixCoO2 thin film and thermopower enhancement at high Li concentration
arXiv:1008.4635 · doi:10.1103/PhysRevB.82.075325
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.
References in corpus (13)
- "Pudding mold" band drives large thermopower in NaCoO
- Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy
- Magnetism and structure of LixCoO2 and comparison to NaxCoO2
- Scaling behavior in thermoelectric misfit cobalt oxides
- Electronic phase diagram of the layered cobalt oxide system, LixCoO2 (0.0 <= x <= 1.0)
- Na Induced Correlations in NaCoO
- Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates
- Electronic texture of the thermoelectric oxide Na0.75CoO2
- Strong Correlations Produce the Curie-Weiss Phase of NaCoO
- Melting of the Na layers in solid Na0.8CoO2
- Direct observation of strong correlations near the band insulator regime of Bi misfit cobaltates
- Spin polaron theory for the photoemission spectra of layered cobaltates
- Evidence for Oxygen Holes due to d-p Rehybridization in Thermoelectric Sr_{1-x}Rh_{2}O_{4}