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arXiv 0712.3161cond-mat.str-el
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双交换模型中的热电功率

Thermoelectric Power in the Double Exchange Model

Beom Hyun Kim, Unjong Yu, Kyoo Kim, B. I. Min

摘要:

采用Monte-Carlo方法和精确对角化方法,研究了双交换模型在稀载流子浓度极限下的热电势与温度的关系。我们发现,TEP遵循Heikes公式在高温区,而在中温区,TEP被抑制的巡游电子和本地自旋之间的交换耦合。在低温区,TEP在磁转变温度$T_C$附近表现出反常的峰谷特征,这可以根据磁极化子态来理解。我们还发现,在磁场的存在下,TEP在$T_C$附近显示出正的磁热电势。

英文摘要:

Employing the Monte-Carlo method and the exact diagonalization, we have investigated the temperature dependence of the thermoelectric power (TEP) for the double exchange model in the dilute carrier concentration limit. We have found that the TEP follows the Heikes formula in the high temperature regime, whereas, in the intermediate temperature regime, the TEP is suppressed by the exchange coupling between itinerant electrons and local spins. In the low temperature regime, the TEP exhibits an anomalous peak and dip feature near the magnetic transition temperature $T_C$ which can be understood based on the magnetic polaron state. We have also found that the TEP, in the presence of the magnetic field, shows the positive magnetothermoelectric power near $T_C$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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