The mechanisms responsible for broadening of the resistive transition under magnetic field in the Josephson junction network realized in bulk YBCO+CuO composites

被引：8
|
作者：
Balaev, DA [1 ]
Popkov, SI [1 ]
Shaihutdinov, KA [1 ]
Petrov, MI [1 ]
机构：
[1] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2006年 / 435卷 / 1-2期
关键词：
Josephson network; YBCO plus CuO composites; dissipation; magnetic field;
D O I：
10.1016/j.physc.2006.01.008
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The experimental results of the effect of the magnetic field (up to 60 kOe) on the broadening of the resistive transition of bulk composites Y3/4Lu1/4Ba2CU3O7 (YBCO) + CuO are presented. These composites represent the network of the tunnel-type Josephson junctions where the copper oxide acts as a material forming barriers between YBCO crystallites. The mechanisms responsible for broadening of the resistive transition under magnetic field are discussed. The analysis of experimental R(7) dependences have shown that in the low field range 0-10(2) Oe, the R(7) dependences are described well by the Ambegaokar-Halperin (AH) model. In the range 10(3)-6 x 10(4) Oe, the dissipation follows Arrhenius law R similar to exp(-U(H)/k(B)T) characteristic for thermally activated flux creep model. In the range H similar to 10(2)-10(3), the crossover from AH to flux creep dissipation mechanisms occurs. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：12 / 15
页数：4
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