Thermopower and transport mechanism of the La_{2鈭?span style='font-style: italic'>x}Sr_xCu_0.94Ti_0.06O₄ system

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• 作者：Caixia Wang^a ; ^{cxwang@issp.ac.cn} ; Xiaobing Chen^a ; Aiping Zhu^b
• 关键词：A. High-Tc superconductors ; D. Electronic transport ; D. Thermal properties
• 刊名：Solid State Communications
• 出版年：2012
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：June, 2012
• 卷：152
• 期：12
• 页码：1067-1071
• 文件大小：399 K

摘要

The thermal properties and their relationship to the charge transport properties of the La_2鈭?em>xSr_xCu_0.94Ti_0.06O₄ solid solution series have been investigated by means of electric resistivity and thermopower measurements. The different changes of the broad peak in S-T curves for Sr-doped samples were observed, which may result from the itinerant hole carriers. The transport mechanism of La_2鈭?em>xSr_xCu_0.94Ti_0.06O₄ is mainly dominated by the small-polaron hopping due to the discrepancy in the activation energy derived from the resistivity and the thermoelectric power. The small polarons are not originated from the magnetic coupling between magnetic ions and hole spins, but from the coupling between the phonon with a breathing mode and the hole carriers.