Composition dependence of superconductivity and surface morphology of MgB2 thin films grown by molecular beam epitaxy

被引：10
|
作者：
Yamamoto, H
Tsukamoto, A
Hasegawa, H
Saitoh, K
Okada, M
Kitaguchi, H
机构：
[1] Hitachi Ltd, Adv Res Lab, Kokubunji, Tokyo 1858601, Japan
[2] Hitachi Ltd, Mat Res Lab, Hitachi, Ibaraki 3191292, Japan
[3] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2005年 / 426卷
关键词：
MgB2; thin film; composition; superconducting thin film; MBE;
D O I：
10.1016/j.physc.2005.01.071
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The relationship between the composition and the superconducting properties of MgxB2 films fabricated by molecular beam epixay (MBE) were investigated. The MgxB2 films-with a composition gradient of Mg and B-were formed on c-plane Al2O3 (0001) substrates by controlling the in-plane distribution of the flux rate of Mg on the substrates. It was found that the composition of the films on the substrates, x (in MgxB2), gradually changed from 0.68 to 2.75. Though the composition was distributed widely, the films showed superconductivity in their whole area. Thin films with a critical temperature of 31-33 K, critical current density of 0.8-1.1 x 10(7) A/cm(2) at 4.2 K, and surface roughness of 2-3 nm were obtained in a wide range of film compositions from stoichiometric to Mg-poor (i.e., x = 0.68-0.96). The films with these properties can be applied for multilayered structures in device applications. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：1444 / 1448
页数：5
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