Seebeck coefficient of Nax CoO2: Measurements and a narrow-band model
Journal
Physical Review B - Condensed Matter and Materials Physics
Journal Volume
79
Journal Issue
7
Date Issued
2009
Author(s)
Abstract
We have performed Seebeck coefficient (S) measurement for a series of high-quality Nax CoO2 single crystals for 0.23≤x≤0.84 from 10 to 300 K. The room-temperature S values were found to be around 30-100μV/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 Nax CoO2 system. © 2009 The American Physical Society.
Type
journal article