Transport characteristics in YBCO thin film superconductors

被引：0

作者：

Kim, S ^{[1
]}

Takahashi, Y ^{[1
]}

Matsumoto, K ^{[1
]}

Takagi, T ^{[1
]}

Machi, T ^{[1
]}

Koshizuka, N ^{[1
]}

Ishiyama, A ^{[1
]}

Hirabayashi, I ^{[1
]}

机构：

[1] ISTEC, Superconduct Res Lab, Nagoya, Aichi 4568587, Japan

来源：

ADVANCES IN SUPERCONDUCTIVITY XII | 2000年

关键词：

YBCO; pulsed laser deposition; magneto-optical imaging; dynamic magnetic flux;

D O I：

暂无

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We studied influences of growth temperature on superconducting characteristics in YBa2Cu3O7-x (YBCO) thin films prepared by pulsed laser deposition (PLD). The films deposited at low growth temperature (below 730 degrees C) have a high c-axis orientation, good in-plane alignment and large amount of a-axis grains. With increasing growth temperature, the number of a-axis grains in the films were decreased, whereas superconducting properties were degraded due to the formation of misoriented grain boundaries. The crystal defects acting as barriers to supercurrent flow were observed by magneto-optical imaging (MOI) technique. Using this technique, we confirmed that the critical current densities of the films were limited by these defects. Dynamic magnetic flux behaviors in flux flow state were also observed by MOI system.

引用

页码：619 / 621

页数：3

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