Single Vortex Pinning and Penetration Depth in Superconducting NdFeAsO${}_{1-x}$F${}_x$

Abstract

We use a magnetic force microscope (MFM) to investigate single vortex pinning and penetration depth in NdFeAsO${}_{1-x}$F${}_x$, one of the highest-$T_c$ iron-based superconductors. In fields up to 20 Gauss, we observe a disordered vortex arrangement, implying that the pinning forces are stronger than the vortex-vortex interactions. We measure the typical force to depin a single vortex, $F_{\mathrm{depin}}\simeq 4.5$ pN, corresponding to a critical current up to $J_c\simeq 7\times 10^5$ A/cm${}^2$. Furthermore, our MFM measurements allow the first local and absolute determination of the superconducting in-plane penetration depth in NdFeAsO${}_{1-x}$F${}_x$, ${\lambda }_{ab}=320\pm 60$ nm, which is larger than previous bulk measurements.

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