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

页码：203 / 208

页数：6

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