A HIGH-RESOLUTION NEUTRON-DIFFRACTION STUDY ON TL2BA2CACU2O8-Y - Y=0, 0.05, 0.06

被引：25

作者：

OGBORNE, DM ^{[1
]}

WELLER, MT ^{[1
]}

LANCHESTER, PC ^{[1
]}

机构：

[1] UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND

来源：

PHYSICA C | 1992年 / 200卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(92)90339-E

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Samples of Tl2Ba2CaCu2O8-y have been prepared with three different oxygen stoichiometries by reaction under various oxygen gas partial pressures. Powder neutron diffraction studies on these materials show that for y > 0 oxygen vacancies exist in the thallium-oxygen layer; filling this site results in a contraction of the lattice c-parameter with concomitant reduction in the apical Cu-O bond length but with an expansion of the copper-oxygen inter-layer distance. These structural changes which occur as a function of oxygen content are discussed in terms of the superconducting properties of these materials and compared with those of the Tl2Ba2Ca2Cu3O10-y system.

引用

页码：207 / 214

页数：8

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