UV-LIGHT IRRADIATION EFFECTS ON OXIDE SUPERCONDUCTING THIN-FILMS

被引：2
|
作者：
ENOKIHARA, A
KOHIKI, S
HIGASHINO, H
SETSUNE, K
WASA, K
机构：
[1] Central Research Laboratories, Matsushita Electric Industrial Co. Ltd., Morighuchi
来源：
IEEE TRANSACTIONS ON MAGNETICS | 1991年 / 27卷 / 02期
关键词：
D O I：
10.1109/20.133478
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Bi2Sr2CaCu2O(x) thin films prepared on (100) MgO substrates by rf magnetron sputtering were irradiated with ultra-violet (UV) light in He gas of about 500 Pa using a low pressure mercury lamp. The zero-resistance temperature and the critical current density were gradually decreased with irradiation time. X-ray photoemission spectra showed that the mean Cu valence of the film was decreased approximately from +2 to +1 by the irradiation while the valence of Bi ions was not changed. These imply that the UV light irradiation selectively reduces Cu ions and the superconductivity strongly depends on the Cu valence.
引用
收藏
页码：1544 / 1547
页数：4
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