DISORDER-INDUCED UNBINDING OF A FLUX-LINE FROM AN EXTENDED DEFECT

被引:62
作者
BALENTS, L [1 ]
KARDAR, M [1 ]
机构
[1] MIT,DEPT PHYS,CAMBRIDGE,MA 02139
来源
PHYSICAL REVIEW B | 1994年 / 49卷 / 18期
关键词
D O I
10.1103/PhysRevB.49.13030
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study the competition, for a single flux line, between pinning by bulk point randomness and an extended defect, such as an ion track, dislocation line, or twin plane. In three dimensions, there is an unbinding transition for a linear (but not a planar) defect. This transition is analyzed using Flory, Migdal-Kadanoff, functional renormalization-group, and numerical methods. The localization length, describing the typical transverse separation between the vortex line and defect, diverges like l(perpendicular-to) approximately \T - T(c)\-nu perpendicular-to, with nu(perpendicular-to) almost-equal-to 1.4. We predict the effects of this localization length on the I-V characteristics of the superconductor, and suggest experiments to observe the transition.
引用
收藏
页码:13030 / 13048
页数:19
相关论文
共 52 条
[1]   LARGE-N EXPANSION OF (4-EPSILON)-DIMENSIONAL ORIENTED MANIFOLDS IN RANDOM-MEDIA [J].
BALENTS, L ;
FISHER, DS .
PHYSICAL REVIEW B, 1993, 48 (09) :5949-5963
[2]   LOCALIZATION OF ELASTIC LAYERS BY CORRELATED DISORDER [J].
BALENTS, L .
EUROPHYSICS LETTERS, 1993, 24 (06) :489-494
[3]   DELOCALIZATION OF FLUX LINES FROM EXTENDED DEFECTS BY BULK RANDOMNESS [J].
BALENTS, L ;
KARDAR, M .
EUROPHYSICS LETTERS, 1993, 23 (07) :503-509
[4]  
BALENTS L, UNPUB
[5]   RENORMALIZATION-GROUP CALCULATIONS OF FINITE SYSTEMS - ORDER PARAMETER AND SPECIFIC-HEAT FOR EPITAXIAL ORDERING [J].
BERKER, AN ;
OSTLUND, S .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1979, 12 (22) :4961-4975
[6]   VORTEX CONFINEMENT BY COLUMNAR DEFECTS IN YBA2CU3O7 CRYSTALS - ENHANCED PINNING AT HIGH FIELDS AND TEMPERATURES [J].
CIVALE, L ;
MARWICK, AD ;
WORTHINGTON, TK ;
KIRK, MA ;
THOMPSON, JR ;
KRUSINELBAUM, L ;
SUN, Y ;
CLEM, JR ;
HOLTZBERG, F .
PHYSICAL REVIEW LETTERS, 1991, 67 (05) :648-651
[7]   POLYMERS ON DISORDERED HIERARCHICAL LATTICES - A NONLINEAR COMBINATION OF RANDOM-VARIABLES [J].
COOK, J ;
DERRIDA, B .
JOURNAL OF STATISTICAL PHYSICS, 1989, 57 (1-2) :89-139
[8]  
de Gennes P. G., 1966, SUPERCONDUCTIVITY ME
[9]   DIRECTED POLYMERS ON DISORDERED HIERARCHICAL LATTICES [J].
DERRIDA, B ;
GRIFFITHS, RB .
EUROPHYSICS LETTERS, 1989, 8 (02) :111-116
[10]  
DOLAN GJ, 1989, PHYS REV LETT, V68, P829