TITLE

Anisotropic thermoelectric properties in layered cobaltite AxCoO2 (A=Sr and Ca) thin films

AUTHOR(S)
Kanno, Tsutomu; Yotsuhashi, Satoshi; Adachi, Hideaki
PUB. DATE
August 2004
SOURCE
Applied Physics Letters;8/2/2004, Vol. 85 Issue 5, p739
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have fabricated epitaxial thin films of layered cobaltite AxCoO2 (A=Sr and Ca) on sapphire substrates by rf magnetron sputtering. The grown phase in the AxCoO2 films was found to be a monoclinic β-phase of primitive layered cobaltites and the epitaxial orientation of the film could be controlled by the surface plane of the substrates. The resistivity parallel to the CoO2 layers ρ∥ for the β-SrxCoO2 is as low as 2 mΩ cm at room temperature and shows metallic behavior. The ratio of perpendicular resistivity ρ⊥ to ρ∥ increases from 20 at room temperature to 90 at 3 K. More isotropic nature was observed in the Seebeck coefficient. Parallel Seebeck coefficients S∥ of AxCoO2 are approximately 60 μV/K at room temperature and the perpendicular S⊥ are about half of S∥.
ACCESSION #
13926111

 

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