Abstract
We have performed Seebeck coefficient $(S)$ measurement for a series of high-quality ${\text{Na}}_{x}{\text{CoO}}_{2}$ single crystals for $0.23\ensuremath{\le}x\ensuremath{\le}0.84$ from 10 to 300 K. The room-temperature $S$ values were found to be around $30--100\text{ }\ensuremath{\mu}\text{V}/\text{K}$ and increase with increasing Na content. The temperature dependence of Seebeck coefficient of this system was found to be very sensitive for $x=1/2$, which is most likely due to the significant modifications of band structure as a result of the magnetic and charge orderings below 88 and 51 K. The overall observed features of the $S(T)$ were analyzed in the framework of a narrow-band model. The physical parameters obtained from the fitting provide a satisfactory description of the composition and temperature dependences of Seebeck coefficient in the ${\text{Na}}_{x}{\text{CoO}}_{2}$ system.
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