Superconductivity at 33 K in "111" single crystals at ambient pressure

T. -L. Xia, J. B. He, D. M. Wang +1

We have successfully grown single crystalline NaFeAs with cobalt or phosphor doping. Bulk superconductivity occurs in NaFe${}_{0.95}$Co${}_{0.05}$As at 19 K while much higher transitio…