"Pudding mold" band drives large thermopower in Na$_x$CoO$_2$

Details "Pudding mold" band drives large thermopower in Na$_x$CoO$_2$ "Pudding mold" band drives large thermopower in Na$_x$CoO$_2$

2007-05-22

arxiv.org/abs/0705.3088v1

J. Phys. Soc. Jpn., Vol.76, No.8, p.083707 (2007), selected as "Papers of Editors' Choice"

Physics

Condensed Matter

Materials Science

5 pages

Scientific paper

10.1143/JPSJ.76.083707

In the present study, we pin down the origin of the coexistence of the large thermopower and the large conductivity in Na$_x$CoO$_2$. It is revealed that not just the density of states (DOS), the effective mass, nor the band width, but the peculiar {\it shape} of the $a_{1g}$ band referred to as the "pudding mold" type, which consists of a dispersive portion and a somewhat flat portion, is playing an important role in this phenomenon. The present study provides a new guiding principle for designing good thermoelectric materials.

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