Oxygen annealing and superconductivity of HgBa2Ca2Cu3O8+y thin films

被引：8
|
作者：
Kang, WN [1 ]
Lee, SI
Chu, CW
机构：
[1] Pohang Univ Sci & Technol, Dept Phys, Natl Creat Res Initiat Ctr Superconduct, Pohang 790784, Kyungbuk, South Korea
[2] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA
来源：
PHYSICA C | 1999年 / 315卷 / 3-4期
关键词：
HgBa2Ca2Cu3O8 thin films; high-T-c superconductors; critical current density; dimensional crossover;
D O I：
10.1016/S0921-4534(99)00191-4
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We studied the effects of oxygen-annealing temperature on the superconductivity of epitaxial HgBa2Ca2Cu3O8+y thin films fabricated by pulsed laser deposition. The highest transition temperature of 133 K for the films grown on (100) SrTiO3 was obtained after oxygen annealing at 340 degrees C for 12 h. The observed critical current density of 1.9 x 10(7) A/cm(2) at 10 K, and 2.6 x 10(5) A/cm(2) at 120 K in zero-field is high enough for the application of the superconducting quantum interference devices (SQUIDs) operated at 120 K. A dimensional crossover from 3D to 2D vortex states is observed from the temperature dependence of the irreversibility line. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：223 / 226
页数：4
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