Filamentary superconductivity across the phase diagram of Ba(Fe,Co)${}_2$As${}_2$

H. Xiao, T. Hu, S. K. He +10

We show magnetotransport results on Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ ($0.0\le x\le 0.13$) single crystals. We identify the low temperature resistance step at 23 K in the parent c…