CeO2 compatibility with YBa2Cu3O7-delta in superconducting-film multilayers

被引:31
作者
Boikov, YA
Claeson, T
Erts, D
Bridges, F
Kvitky, Z
机构
[1] GOTHENBURG UNIV,S-41296 GOTHENBURG,SWEDEN
[2] UNIV CALIF SANTA CRUZ,DEPT PHYS,SANTA CRUZ,CA 95064
[3] RUSSIAN ACAD SCI,AF IOFFE PHYSICOTECH INST,ST PETERSBURG 194021,RUSSIA
[4] LATVIAN STATE UNIV,INST CHEM PHYS,LV-1063 RIGA,LATVIA
来源
PHYSICAL REVIEW B | 1997年 / 56卷 / 17期
关键词
D O I
10.1103/PhysRevB.56.11312
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
High-quality superconducting (T-c approximate to 90 K, j(c)> 10(6) A/cm(2) at 77 K) epitaxial (001) YBa2Cu3O7-delta films were grown by laser ablation on (001) CeO2/(1 (1) under bar 02) Al2O3. An interaction between YBa2Cu3O7-delta and CeO2 would influence the structure and the superconducting parameters. A marked degradation of the superconducting transition temperature (T-c=74 K) was observed when twenty 2-nm-rhick CeO2 layers were inserted equidistantly into a (001) YBa2Cu3O7-delta film (200 nm). BaCeO3 crystalline inclusions were detected by xray diffraction. X-ray-absorption fine-structure investigations at the Cu-K edge indicate that Ce substitutes for Y in YBa2Cu3O7-delta. Near-edge x-ray-absorption studies indicate that the valence of Ce incorporated into the YBa2Cu3O7-delta regions of the multilayer structure is also +4.
引用
收藏
页码:11312 / 11319
页数:8
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