Renormalization group study of the intrinsic finite-size effect in two-dimensional superconductors

Article

关键词: KOSTERLITZ-THOULESS TRANSITION;    LAYERED SUPERCONDUCTORS;    CRITICAL-BEHAVIOR;    XY-MODEL;    PHASE-TRANSITIONS;    SYSTEM;    VORTICES;    FILMS;    DIAGRAM;    ARRAYS;   

DOI  :  10.1103/PhysRevB.61.663

来源: SCIE

【 摘 要 】

Vortices in a thin-film superconductor interact logarithmically out to a distance on the order of the two-dimensional (2D) magnetic penetration depth lambda(perpendicular to), at which point the interaction approaches a constant. Thus, because of the finite lambda(perpendicular to), the system exhibits what amounts to an intrinsic finite-size effect. It is not described by the 2D Coulomb gas but rather by the 2D Yukawa gas (2DYG). To study the critical behavior of the 2DYG, we map the 2DYG to the massive sine-Gordon model and then perform a renormalization group study to derive the recursion relations and to verify that lambda(perpendicular to) is a relevant parameter. We solve the recursion relations to study important physical quantities for this system including the renormalized stiffness constant and the correlation length. We also address the effect of current on this system to explain why finite-size effects are not more prevalent in experiments given that the 2D magnetic penetration depth is a relevant parameter.

【 授权许可】

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