Instability of vortex-antivortex interface in optimally-doped Ba(Fe_{1-x}Co_{x})_{2}As_{2}

Abstract

We explore the flux front patterns during virgin penetration and after remagnetization in the iron-based superconductor Ba(Fe_{1-x}Co_{x})_{2}As_{2}. After remagnetization we observe an instability characterized by turbulent dynamics at the vortex-antivortex boundary. Associated with the turbulent flux boundary a band of excess current density is observed. The turbulence is contrasted with the instability observed in the cuprate superconductors. Our results suggest turbulent instability at the vortex-antivortex interface may be a common feature in all remagnetized type-II superconductors.

14 pages, 4 figures

References in corpus (6)

• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals
• Enhancement of Critical Current Densities in Co-Doped BaFe${}_2$As${}_2$ with Columnar Defects Introduced by Heavy-Ion Irradiation
• Intrinsic pinning on structural domains in underdoped single crystals of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Possible superconductivity above 25 K in single crystalline Co-doped BaFe${}_2$As${}_2$
• Thermomagnetic instability of standing flux-antiflux front in layered type-II superconductors