STRUCTURAL STUDY OF SR2CUO3+DELTA BY NEUTRON POWDER DIFFRACTION

被引：70
|
作者：
SHIMAKAWA, Y
JORGENSEN, JD
MITCHELL, JF
HUNTER, BA
SHAKED, H
HINKS, DG
HITTERMAN, RL
HIROI, Z
TAKANO, M
机构：
[1] ARGONNE NATL LAB,DIV MAT SCI,IDAHO FALLS,ID 83401
[2] ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,IDAHO FALLS,ID 83401
[3] KYOTO UNIV,INST CHEM RES,UJI,KYOTO 611,JAPAN
[4] NUCL RES CTR NEGEV,DEPT PHYS,IL-84190 BEER SHEVA,ISRAEL
[5] BEN GURION UNIV NEGEV,DEPT PHYS,IL-84105 BEER SHEVA,ISRAEL
来源：
PHYSICA C | 1994年 / 228卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1016/0921-4534(94)90175-9
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Average crystal structures of superconducting Sr2CuO3+delta synthesized under high pressure and nonsuperconducting Sr2CuO3+delta synthesized at ambient pressure from a hydroxometallate precursor were refined from neutron powder diffraction data. A simplified model was used to fit the modulated superstructures. Both compounds have an oxygen-deficient La2CuO4-type tetragonal T structure with oxygen vacancies located in the Cu02 planes, not in the Sr2O2 layers. This result raises important questions regarding the nature of superconductivity in Sr2CuO3+delta reported to be a 70 K superconductor.
引用
收藏
页码：73 / 80
页数：8
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