Theoretical study of thermoelectric and Hall effects in the layered cobalt oxides, Na_x

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• 作者：Wataru Koshibae ; Akira Oguri ; Sadamichi Maekawa
• 关键词：A. Oxides ; D. Electronic structure ; D. Transport properties
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：69
• 期：12
• 页码：3214-3216
• 全文大小：239 K

文摘

We examine the response of the transport properties to the magnetic field and temperature gradient in the Hubbard model on the kagomé lattice within the limit of U→∞, using the “retraceable-path” approximation. The layered cobalt oxides, Na_xCoO₂, involve the triangular lattice of the cobalt ions. However, the electron trajectory makes up the kagomé lattice due to the orbital degeneracy of t_2g states. It is shown that this kagomé lattice hidden in the CoO₂ layer exhibits the anomalous high-temperature Hall effect recently observed by Wang et al.