Transport properties in the calcium-doped Nd-Ce-Cu-O system

被引：4

作者：

Chen, XH ^{[1
]}

Ruan, KQ ^{[1
]}

Feng, Y ^{[1
]}

Wang, CY ^{[1
]}

Cao, LZ ^{[1
]}

Jia, YB ^{[1
]}

Zhang, YH ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.54.13306

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Hall coefficient R(H), resistivity, and magnetoresistance have been measured in both superconducting polycrystalline samples of Nd1.85-xCaxCe0.15CuC4-delta and nonsuperconducting samples of Nd2-xCaxCuO4+delta (x less than or equal to 0.3). Addition of Ca does not destroy the superconductivity, but dramatically changes the R(H) and eventually causes a change in sign of R(H) from negative to positive. The hole state in the CuO2 plane arises from the lattice distortion induced by Ca doping, which leads to the O p band going through the Fermi level. The negative magnetoresistance is closely related to the localization of conducting carriers.

引用

页码：13306 / 13310

页数：5

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