Multiple defects in overdoped Tl2Ba2CuO6+delta: Effects on structure and superconductivity

被引:30
作者
Wagner, JL
Chmaissem, O
Jorgensen, JD
Hinks, DG
Radaelli, PG
Hunter, BA
Jensen, WR
机构
[1] ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCOND,ARGONNE,IL 60439
[2] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439
[3] UNIV N DAKOTA,DEPT PHYS,GRAND FORKS,ND 58202
来源
PHYSICA C | 1997年 / 277卷 / 3-4期
关键词
D O I
10.1016/S0921-4534(97)00062-2
中图分类号
O59 [应用物理学];
学科分类号
摘要
It is shown that the superconducting and structural properties of Tl2Ba2CuO6+delta depend on at least two defects. The TI/Cu ratio used during synthesis determines the concentration of a defect that is likely to be Cu substitution on the Tl sire, based on previously published work that proves the existence of such a defect. The structure exhibits a smaller orthorhombic strain, or tetragonal symmetry, for high concentrations of this defect. T-c tends to be lowered by this defect. An oxygen interstitial defect in the Tl-O double layer has a more pronounced effect on T-c, allowing the compound to be overdoped as the concentration of this defect increases. Features in the diffraction data also suggest the existence of a third defect which may involve the filling of oxygen vacancies at an oxygen site in the structure during early stages of oxygenation.
引用
收藏
页码:170 / 182
页数:13
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