DISLOCATION MODEL OF SUPERCONDUCTING TRANSPORT-PROPERTIES OF YBCO THIN-FILMS AND SINGLE-CRYSTALS

被引:45
作者
PAN, VM [1 ]
KASATKIN, AL [1 ]
SVETCHNIKOV, VL [1 ]
ZANDBERGEN, HW [1 ]
机构
[1] DELFT UNIV TECHNOL,MAT SCI LAB,NATL CTR HREM,2628 AL DELFT,NETHERLANDS
关键词
YBA2CU3O7-X; THIN FILMS; SINGLE CRYSTALS;
D O I
10.1016/0011-2275(93)90070-5
中图分类号
O414.1 [热力学];
学科分类号
摘要
Based on structural investigations and measurements of the superconducting electrical properties of YBa2CU3O7-x thin films and single crystals we suggest a dominant contribution for the vortex pinning (H parallel-to C-axis) of low angle grain boundary edge dislocations with Burgers vector bBAR = aBAR [100] with a concentration of about 10(11) cm-2. A theoretical model is developed that describes the depinning mechanism for individual vortices pinned on adjacent parallel linear defects. The vortex energy activation U(J) in this pinning mechanism is shown to depend significantly on the transport current magnitude even in the low current region. This brings about the non-linear behaviour of I - V curves in the TAFF regime.
引用
收藏
页码:21 / 27
页数:7
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