Oxygen dependence of the transport properties of Nd1.78Ce0.22CuO4+/-delta

被引：56
|
作者：
Xu, XQ
Mao, SN
Jiang, W
Peng, JL
Grene, RL
机构：
[1] Department of Physics and Astronomy, Center for Superconductivity Research, University of Maryland, College Park
来源：
PHYSICAL REVIEW B | 1996年 / 53卷 / 02期
关键词：
D O I：
10.1103/PhysRevB.53.871
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have investigated the transport properties of high-quality Nd1.78Ce0.22CuO4+/-delta films as a function of oxygen concentration. Surprisingly we find superconductivity in films that are slowly cooled in vacuum from the deposition temperature. A systematic study of the effect of oxygen on resistivity, Hall effect, and thermopower suggests that extra oxygen introduces impurity scattering without changing the carrier density. Magnetoresistance data reveal that these impurities are spin disordered in nature. The spin impurities introduced upon oxygenation of the sample may be responsible for suppressing the superconductivity.
引用
收藏
页码：871 / 875
页数：5
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