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Preparation of metastable Sr3Co4O9 epitaxial thin films with controlled orientation and their anisotropic thermoelectric properties

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5 Author(s)
Sakai, Akihiro ; Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd., 3-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0237, Japan ; Kanno, Tsutomu ; Yotsuhashi, Satoshi ; Okada, Satoshi
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We have prepared metastable misfit-type Sr3Co4O9 epitaxial films by rf-planar magnetron sputtering. Anisotropic electric resistivity and Seebeck coefficient (parallel and perpendicular to the CoO2 layers) were measured using a-axis-oriented Sr3Co4O9 films where the layer structure stands perpendicularly to the substrate surface. The parallel resistivity exhibited considerable low value of about 2.5 mΩ cm at room temperature. Although the parallel Seebeck coefficient was a little lower than that of the Ca3Co4O9 film at room temperature, the thermoelectric power factor was estimated to be two times higher than that of Ca3Co4O9 owing to lower resistivity in Sr3Co4O9.

Published in:

Journal of Applied Physics  (Volume:99 ,  Issue: 9 )

Date of Publication:

May 2006

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