SURFACE DEGRADATION OF YBA2CU3O7-DELTA OBSERVED BY MEANS OF CONTACT RESISTANCE MEASUREMENT

被引：16

作者：

GRAJCAR, M ^{[1
]}

PLECENIK, A ^{[1
]}

DARULA, M ^{[1
]}

BENACKA, S ^{[1
]}

机构：

[1] SLOVAK ACAD SCI,INST ELECT ENGN,CS-84239 BRATISLAVA,CZECHOSLOVAKIA

来源：

SOLID STATE COMMUNICATIONS | 1992年 / 81卷 / 02期

关键词：

D O I：

10.1016/0038-1098(92)90387-O

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The time dependence of the YBa2Cu3O7-delta (YBaCuO) - metal (Pb, In, Sn, Au) point contact resistance was studied. The measurements were carried out in the temperature range 340 K to 77 K. The point contacts prepared at room temperature exhibit the change of resistance about 100-500 % after the time congruent-to 10(2) sec, however at temperature 77 K no change of contact resistance was observed. The change of the resistance can be explained in terms of oxygen depleted surface layer of YBaCuO material caused by lower activation energy of oxygen on the surface. This time dependence of contact resistance may be well explained by diffusion effects. From the fitting comparison of experimental curves with theory we determined the diffusion coefficient which characterizes the diffusion process of the oxygen ions in the bulk of YBaCuO material.

引用

页码：191 / 194

页数：4

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