LATTICE INSTABILITIES AND THE EFFECT OF COPPER-OXYGEN-SHEET DISTORTIONS ON SUPERCONDUCTIVITY IN DOPED LA2CUO4

被引：263

作者：

CRAWFORD, MK

HARLOW, RL

MCCARRON, EM

FARNETH, WE

AXE, JD

CHOU, H

HUANG, Q

机构：

[1] BROOKHAVEN NATL LAB,UPTON,NY 11973

[2] NATL INST STAND & TECHNOL,REACTOR E151,GAITHERSBURG,MD 20899

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.44.7749

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Synchroton x-ray and neutron-diffraction measurements demonstrate that Nd3+ substitution at the La3+ site in both metallic and insulating La2-xSrxCuO4 induces low-temperature structural instabilities which reorient the tilting of the copper-oxygen octahedra. These structural transformations strongly affect superconductivity. In addition, there is a bicritical point involving phases of Bmab, Pccn, and P4(2)/ncm space-group symmetries in the structural phase diagram of La1.6-xNd0.4SrxCuO4 at x approximately 0.15. There are also anomalies in the structural transformation temperatures and the superconducting transition temperatures when x approximately 1/8, providing evidence for an electronic instability at this doping level.

引用

页码：7749 / 7752

页数：4

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