Soft phonons reveal the nematic correlation length in Ba(Fe${}_{0.94}$Co${}_{0.06}$)${}_2$As${}_2$

F. Weber, D. Parshall, L. Pintschovius +8

Nematicity is ubiquitous in electronic phases of high-$T_c$ superconductors, particularly in the Fe-based systems. While several experiments have probed nematic fluctuations, they…