標題: Sliding Abrikosov vortex lattice in the presence of a regular array of columnar pinning centers: ac conductivity and criticality near the transition to a pinned state
作者: Maniv, T.
Rosenstein, B.
Shapiro, I.
Shapiro, B. Ya.
電子物理學系
Department of Electrophysics
公開日期: 1-十月-2009
摘要: The dynamics of the flux lattice in the mixed state of strongly type-II superconductor near the upper critical field H-c2(T) subjected to ac field and interacting with a periodic array of short-range pinning centers (nanosolid) is considered. The superconductor in a magnetic field in the absence of thermal fluctuations on the mesoscopic scale is described by the time-dependent Ginzburg-Landau equations. An exact expression for the ac resistivity in the case of a delta-function model for the pinning centers in which the nanosolid is commensurate with the Abrikosov lattice (vortices outnumber pinning centers) is obtained. It is found that below a certain critical pinning strength u(c) and sufficiently low frequencies there exists a sliding Abrikosov lattice, which moves nearly uniformly despite interactions with the pinning centers. At small frequencies the conductivity diverges as (u-u(c))(-1), whereas the ac conductivity on the depinning line diverges as i omega(-1). This sliding lattice behavior, which does not exists in the single vortex-pinning regime, becomes possible due to strong interactions between vortices when they outnumber the columnar defects. Physically it is caused by "liberation" of the temporarily trapped vortices by their freely moving neighbors.
URI: http://dx.doi.org/10.1103/PhysRevB.80.134512
http://hdl.handle.net/11536/6581
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.80.134512
期刊: PHYSICAL REVIEW B
Volume: 80
Issue: 13
起始頁: 0
結束頁: 0
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