Preparation of YBCO films by chemical vapor deposition in a magnetic field

被引：14

作者：

Awaji, S ^{[1
]}

Watanabe, K ^{[1
]}

Ma, YW ^{[1
]}

Motokawa, M ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, High Field Lab Superconducting Mat, Aoba Ku, Sendai, Miyagi 980, Japan

来源：

PHYSICA B | 2001年 / 294卷

关键词：

YBa2Cu3O7; film; polycrystalline Ag; MgO; chemical vapor deposition; critical current density; high magnetic fields;

D O I：

10.1016/S0921-4526(00)00705-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 [凝聚态物理];

摘要：

YBCO films on single-crystalline MgO substrates and polycrystalline Ag substrates were prepared by chemical vapor deposition in magnetic fields up to 10 T, using a cryo-cooled superconducting magnet. In the case of the MgO substrates, microstructure was independent of the magnetic field but J(c) was significantly improved. In contrast, with polycrystalline Ag substrates, the microstructure changed drastically; again J(c) was improved. Large square-shaped grains with a size of 5-14 mum were observed for samples grown on Ag substrates at 0T. These grains were reduced in size when a field of several tesla was applied during the CVD process and their shape became irregular above 4T. These changes of the microstructure improve the critical current density. The values of J(c) for the films deposited on the polycrystalline Ag substrates in 8 T were 5.76 x 10(4) A/cm(2) at 0 T and 77.3 K. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：482 / 485

页数：4

共 7 条

[1]

Melt textured process for YBCO in high magnetic fields [J].