Thermoelectric properties of the misfit cobaltate CaCoO
arXiv:1703.10486 · doi:10.1063/1.4984960
Abstract
The layered misfit cobaltate CaCoO, also known as CaCoO[CoO], is a promising p-type thermoelectric oxide. Employing density functional theory, we study its electronic structure and determine, on the basis of Boltzmann theory within the constant-relaxation-time approximation, the thermoelectric transport coefficients. The dependence on strain and temperature is determined. In particular, we find that the -component of the thermopower is strongly enhanced, while the -component is strongly reduced, when applying 2% tensile strain. A similar anisotropy is also found in the power factor. The temperature dependence of the conductivity in the - plane is found to be rather weak above 200 K, which clearly indicates that the experimentally observed transport properties are dominated by inhomogeneities arising during sample growth, i.e., are not intrinsic.
12 pages (preprint style), 5 figures
References in corpus (6)
- BoltzTraP. A code for calculating band-structure dependent quantities
- Strongly correlated properties of the thermoelectric cobalt oxide Ca3Co4O9
- Scaling behavior in thermoelectric misfit cobalt oxides
- Colossal Thermoelectric Power Factor in KRhO
- Local Structure of Thermoelectric Ca3Co4O9
- Impact of strain-induced electronic topological transition on the thermoelectric properties of PtCoO and PdCoO