Features of the effect of the Josephson medium parameters on vortex formation and critical current

被引:5
作者
Belevtsov, LV [1 ]
Kostikov, AA
机构
[1] Natl Acad Sci Ukraine, Galkin Physicotech Inst, UA-83114 Donetsk, Ukraine
[2] Donbass State Machine Bldg Acad, UA-84313 Kramatorsk, Donetsk Oblast, Ukraine
关键词
D O I
10.1134/1.2103219
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The response of an intergranular Josephson junction to displacements of an Abrikosov vortex in a superconducting polycrystal is studied theoretically. The vortex filament in the vicinity of the junction excites a tunnel current in the junction and also generates a Josephson vortex with which it merges upon emergence at the surface of the junction. It is shown that the process of the Josephson vortex formation passes through a stage of overcoming a potential barrier, whose height depends on the distance between the Abrikosov vortex and the junction, as well as on the effective thickness of the junction, which is determined by the characteristic grain size, grain anisotropy, and the intensity of the intergranular coupling. The magnetic field dependence of the critical current of the intergranular Josephson junction is determined for various grain and intergranular parameters, as well as for the triangular and square configurations of the Abrikosov vortex lattice. The results indicate that a high degree of texturing in the grain size, anisotropy, and intensity of intergranular coupling is very important for obtaining high critical currents in pure polycrystalline materials. (c) 2005 Pleiades Publishing, Inc.
引用
收藏
页码:504 / 512
页数:9
相关论文
共 26 条
[1]   Intrinsic Josephson effect and violation of the Josephson relation in layered superconductors [J].
Artemenko, SN ;
Kobelkov, AG .
PHYSICAL REVIEW LETTERS, 1997, 78 (18) :3551-3554
[2]   OBSERVATIONS AND IMPLICATIONS OF GRAIN-BOUNDARY DISLOCATION NETWORKS IN HIGH-ANGLE YBA2CU3O7-DELTA GRAIN-BOUNDARIES [J].
BABCOCK, SE ;
LARBALESTIER, DC .
JOURNAL OF MATERIALS RESEARCH, 1990, 5 (05) :919-928
[3]   SURFACE BARRIER IN TYPE-2 SUPERCONDUCTORS [J].
BEAN, CP ;
LIVINGSTON, JD .
PHYSICAL REVIEW LETTERS, 1964, 12 (01) :14-&
[4]   Interaction of Abrikosov vortex with grain boundaries near Hc1.: I.: Potential barriers in polycrystalline high-Tc superconductors [J].
Belevtsov, LV .
LOW TEMPERATURE PHYSICS, 2005, 31 (02) :116-122
[5]   Grain boundary effects on transport properties in strongly coupled superconductors: A Monte Carlo study [J].
Belevtsov, LV ;
Pervukhin, VN .
EUROPHYSICS LETTERS, 2004, 67 (04) :648-654
[6]   Vortex edge barriers and critical current density in granular superconductors [J].
Belevtsov, LV .
PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 2003, 237 (02) :523-529
[7]   Interplay between surface effects and the magnetic properties in polycrystalline superconductors [J].
Belevtsov, LV .
JOURNAL OF LOW TEMPERATURE PHYSICS, 2003, 131 (1-2) :37-49
[8]   Possible new edge barriers in polycrystalline superconductors [J].
Belevtsov, LV .
EUROPHYSICS LETTERS, 2002, 59 (05) :768-773
[9]  
DENISOV YP, 1976, FIZ TVERD TELA+, V18, P119
[10]   NEW CRITICAL-STATE MODEL FOR CRITICAL CURRENTS IN CERAMIC HIGH-TC SUPERCONDUCTORS [J].
DERSCH, H ;
BLATTER, G .
PHYSICAL REVIEW B, 1988, 38 (16) :11391-11404