Anomalous thermopower of the electron-doped superconductor, SM2-xCexCuO4

被引：5
|
作者：
Yang, HS [1 ]
Chai, YS [1 ]
Liu, J [1 ]
Yu, M [1 ]
Li, PC [1 ]
Zhang, L [1 ]
Li, MD [1 ]
Cao, LZ [1 ]
机构：
[1] Univ Sci & Technol China, Dept Phys, Struct Res Lab, Anhua 230026, Peoples R China
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2004年 / 403卷 / 03期
关键词：
transport properties; cuprate superconductor; thermoelectric power;
D O I：
10.1016/j.physc.2003.12.012
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The thermopower of Sm2-xCexCuO4 single crystal (x = 0. 15) and polycrystalline samples (0.06 less than or equal to x less than or equal to 0.21) has been measured. The positive slope in thermopower in the underdoped region emphasizes the existence of a high temperature regime above 200 K or so where only including the Fermi liquid model is not satisfactory. The high temperature thermopower suggests that a competition exists between the electron-type (energy band) band and hole-type (polaron band) band contributions. The crossover of charge carriers from hole-type to electron-type happens at x = 0.17. The changes of slopes in the thermopower below about 200 K are attributed to the opening of a pseudogap in the underdoped region and the localization of electrons in the energy band in the overdoped region. A positive phonon-drag contribution for thermopower near 50 K is observed, indicating that the signs of the carriers are positive at low temperature. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：203 / 208
页数：6
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