Seebeck coefficient of NaxCoO2: Measurements and a narrow-band model

被引：32

作者：

Kaurav, N. ^{[1
]}

Wu, K. K. ^{[1
]}

Kuo, Y. K. ^{[1
]}

Shu, G. J. ^{[2
]}

Chou, F. C. ^{[2
]}

机构：

[1] Natl Dong Hwa Univ, Dept Phys, Hualien 97401, Taiwan

[2] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 10617, Taiwan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 07期

关键词：

band structure; Seebeck effect; sodium compounds; THERMOELECTRIC PROPERTIES; THERMOPOWER; SUPERCONDUCTIVITY; SUBSTITUTION;

D O I：

10.1103/PhysRevB.79.075105

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed Seebeck coefficient (S) measurement for a series of high-quality NaxCoO2 single crystals for 0.23 <= x <= 0.84 from 10 to 300 K. The room-temperature S values were found to be around 30-100 mu V/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 NaxCoO2 system.

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页数：6

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