SYNTHESIS OF THE DEFECT PEROVSKITE SERIES LACUO3-DELTA WITH COPPER VALENCE VARYING FROM 2+ TO 3+

被引：99

作者：

BRINGLEY, JF ^{[1
]}

SCOTT, BA ^{[1
]}

LAPLACA, SJ ^{[1
]}

BOEHME, RF ^{[1
]}

SHAW, TM ^{[1
]}

MCELFRESH, MW ^{[1
]}

TRAIL, SS ^{[1
]}

COX, DE ^{[1
]}

机构：

[1] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973

来源：

NATURE | 1990年 / 347卷 / 6290期

关键词：

D O I：

10.1038/347263a0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

MANY important questions about the origin of superconductivity in the high-temperature copper oxide superconductors could be addressed by the study of a copper oxide compound exhibiting a wide range of oxygen stoichiometry while maintaining the basic perovskite structure. A number of compounds are known in which copper occurs formally as Cu3+ (refs 1, 2), but most are structurally unrelated to the superconductors, so that a direct comparison of their chemical and physical properties is not appropriate. Here we report the synthesis, structure and preliminary characterization of a new oxygen-deficient perovskite series, LaCuO3-δ. Although superconductivity has not been observed in this system, its oxygen stoichiometry range, 0.0 < δ < 0.5, is the widest yet found in a copper oxide compound, allowing the formal copper valence to be varied from 2+ to 3+. This series may thus serve as a model system with which to address such questions as the nature of the Cu/O hole states in the superconductors, and the way in which magnetic and transport properties vary with carrier concentration. © 1990 Nature Publishing Group.

引用

页码：263 / 265

页数：3

共 9 条

[1] CRYSTAL-STRUCTURES OF NACUO2 AND KCUO2 BY NEUTRON-DIFFRACTION [J].