Topological defects in the random-field XY model and the pinned vortex lattice to vortex glass transition in type-II superconductors

被引:203
作者
Gingras, MJP [1 ]
Huse, DA [1 ]
机构
[1] AT&T BELL LABS,MURRAY HILL,NJ 07974
来源
PHYSICAL REVIEW B | 1996年 / 53卷 / 22期
关键词
D O I
10.1103/PhysRevB.53.15193
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
As a simplified model of randomly pinned vortex lattices or charge-density waves, we study the random-field XY model on square (d=2) and simple cubic (d=3) lattices. We verify in Monte Carlo simulations that the average spacing between topological defects (vortices) diverges more strongly than the Imry-Ma pinning length as the random field strength H is reduced. We suggest that for d=3 the simulation data are consistent with a topological phase transition at a nonzero critical field H-c to a pinned phase that is defect free at large length scales. We also discuss the connection between the possible existence of this phase transition in the random-field XY model and the magnetic-field-driven transition from a pinned vortex lattice to a vortex glass in weakly disordered type-II superconductors.
引用
收藏
页码:15193 / 15200
页数:8
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