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arXiv · 1109.2703

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

Shyam Mohan·Yuji Tsuchiya·Yasuyuki Nakajima·Tsuyoshi Tamegai
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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.

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Shyam Mohan, Yuji Tsuchiya, Yasuyuki Nakajima, Tsuyoshi Tamegai. 2011-09-13. Instability of vortex-antivortex interface in optimally-doped Ba(Fe_{1-x}Co_{x})_{2}As_{2}. https://doi.org/10.1103/physrevb.84.180504

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