Relationship between composition and surface morphology in YBCO films deposited by large-area PLD

被引：21
作者：
Develos-Bagarinao, K [1 ]
Yamasaki, H [1 ]
Nakagawa, Y [1 ]
Endo, K [1 ]
机构：
[1] Natl Inst AIST, Energy Elect Inst, Superconductro Technol Grp, Tsukuba, Ibaraki 3058568, Japan
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2004年 / 412卷
关键词：
YBCO; yttrium-rich; pores; pulsed laser deposition;
D O I：
10.1016/j.physc.2004.01.172
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
YBCO films deposited from a stoichiometric (Y123) target via a large-area PLD system have consistently been found to be Y-rich in composition as well as characterized by pores. Use of an off-stoichiometric target with increased Ba and Cu content proved to be an effective method to compensate for the deficiency in barium and copper in the films. Films with composition closer to the ideal stoichiometric ratio have been obtained from the off-stoichiometric target, including significantly reduced pore density, improved microstructure and higher critical current density (J(c)) in excess of 2 MA/cm(2) at 77.3 K over a 2"-diameter area. Furthermore, it was found out that the dense and smooth YBCO film deposited from the off-stoichiometric target needed ex situ oxygen annealing to reach fully-oxygenated state. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：1286 / 1290
页数：5
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