Anomalies in thermoelectric power at 200 K in the calcium-doped NdCeCuO system

被引：3

作者：

Chen, XH ^{[1
]}

Li, TF ^{[1
]}

Wang, RP ^{[1
]}

Qiu, YM ^{[1
]}

Ruan, KQ ^{[1
]}

Cao, LZ ^{[1
]}

Shi, L ^{[1
]}

Jia, YB ^{[1
]}

Zhou, GE ^{[1
]}

Zhang, YH ^{[1
]}

机构：

[1] UNIV SCI & TECHNOL CHINA,ACAD SINICA,DEPT PHYS,HEFEI 230026,ANHUI,PEOPLES R CHINA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1997年 / 9卷 / 07期

关键词：

D O I：

10.1088/0953-8984/9/7/002

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Samples of Nd1.85-xCe0.15CaxCuOy are characterized by thermoelectric power and variable-temperature x-ray diffraction. For the superconducting sample Nd1.85Ce0.15CuOy, S is positive in the whole measuring temperature range and weakly dependent on temperature; for the Ca-doped samples, Nd1.85-xCe0.15CaxCuOy, S shows a negative and strong dependence on temperature at low temperature for large x. It is striking that Ca doping leads to a sharp peak at about 200 K for either the superconducting samples Nd1.85-xCe0.15CaxCuOy or the nonsuperconducting samples Nd2-xCaxCuOy. The strength of the peak increases with increasing x. Low-temperature x-ray diffraction shows that the lattice parameters decrease with decreasing temperature and an anomaly is observed at the corresponding temperature.

引用

页码：L75 / L82

页数：8

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