A STRUCTURAL DISTORTION IN THE 123-SUPERCONDUCTOR ISOMORPH LABA2(CU2NB)O8

被引：59

作者：

REY, MJ

DEHAUDT, P

JOUBERT, J

HEWAT, AW

机构：

[1] ECOLE NATL SUPER PHYS GRENOBLE,MAT & GENIE PHYS,F-38400 ST MARTIN DHERES,FRANCE

[2] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE

来源：

PHYSICA C | 1990年 / 167卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(90)90500-E

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A low temperature structural transition in the 123-superconductor YBa2Cu3O7-δ has been proposed involving zig-zag folding of the CuO-chains, but it has not been possible to demonstrate the resulting superlattice reflections because the CuO-chains are broken after relatively short distances unless δ=0. In the 123-isomorph LaB2(Cu2Nb)O8, which is not a superconductor, Y is replaced by La, and the CuO-chains by planes of NbO-octahedra. We find by direct observation of superlattice reflections that zig-zag folding of the NbO-octahedra can indeed occur in this structure type. The tilt pattern is similar to that of the low temperature phase of SrTiO3, with the same I4/mcm space group. © 1990.

引用

页码：162 / 167

页数：6