Enhanced Surface Superconductivity in Ba(Fe${}_{0.95}$Co${}_{0.05}$)${}_2$As${}_2$

Christopher T. Parzyck, Brendan D. Faeth, Gordon N. Tam +2

We present direct evidence for an enhanced superconducting $T_c$ on the surface of cleaved single crystals of Ba(Fe${}_{0.95}$Co${}_{0.05}$)${}_2$As${}_2$. Transport measurements performed…