THE OXYGEN ISOTOPE EFFECT IN SUPERCONDUCTING YBA2CU3O7-DELTA

被引:30
作者
FRANCK, JP
JUNG, J
SALOMONS, G
MINER, WA
MOHAMED, MAK
CHRZANOWSKI, J
GYGAX, S
IRWIN, JC
MITCHELL, DF
SPROULE, GI
机构
[1] SIMON FRASER UNIV,DEPT PHYS,BURNABY V5A 1S6,BC,CANADA
[2] NATL RES COUNCIL CANADA,DIV CHEM,OTTAWA K1A 0R9,ONTARIO,CANADA
来源
PHYSICA C | 1990年 / 172卷 / 1-2期
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/0921-4534(90)90647-W
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report on measurements of the effect of O-18-O-16 substitution on the superconducting properties of Y1Ba2Cu3O7-delta. Substitutions were made by gas-exchange alone, and by gas exchange in conjunction with substituted BaCO3 and CuO. From Raman scattering we find that gas-exchange alone leads to lower substitution levels, particularly in the bridging oxygen O(4) position. Gas-exchanged samples give an isotope effect of 0.3 to 0.4 K. Use of substituted materials leads to samples with an isotope effect of up to 0.9 K in the resistance transition and 1.7 K in the magnetically determined transition.
引用
收藏
页码:90 / 104
页数:15
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