Single crystal growth of BaFe${}_{2-x}$Co${}_x$As${}_2$ without fluxing agent

We report a simple, reliable method to grow high quality BaFe${}_{2-x}$Co${}_x$As${}_2$ single crystal samples without using any fluxing agent. The starting materials for the single crystal growth come from well-crystallized polycrystalline samples and the highest growing temperature can be 1493 K. The as-grown crystals have typical dimensions of 4$\times 3\times$0.5 mm${}^3$ with c-axis perpendicular to the shining surface. We find that the samples have very large current carrying ability, indicating that the samples have good potential technological applications.