STRUCTURE AND SUPERCONDUCTIVITY OF HGBA2CA2CU3O8+DELTA

被引：91
|
作者：
WAGNER, JL
HUNTER, BA
HINKS, DG
JORGENSEN, JD
机构：
[1] ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCOND,ARGONNE,IL 60439
[2] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439
来源：
PHYSICAL REVIEW B | 1995年 / 51卷 / 21期
关键词：
D O I：
10.1103/PhysRevB.51.15407
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have investigated the structure, defect concentration, and superconducting properties of HgBa2Ca2Cu3O8+δ by neutron powder diffraction, thermogravimetric analysis, and ac susceptibility. Samples with three oxygen contents and Tc's ranging from 135 to 94 K, obtained through different annealing conditions, were studied. Two defect sites were observed in all samples. The concentration of defect oxygen atoms located at a site in the center of the Hg-Oδ plane, is found to vary from 0.18(2) to 0.10(2) oxygen atoms per formula unit as Tc decreases from 135 to 94 K. An additional defect, which we interpret as oxygen atoms associated with the substitution of Cu on the Hg site, is found to have a fixed concentration of ∼0.09(2) oxygen atoms per formula unit. © 1995 The American Physical Society.
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页码：15407 / 15414
页数：8
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