Finite-momentum nematic fluctuations soften phonons in the superconducting state of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$

F. Weber, D. Parshall, L. Pintschovius +6

Nematic order is ubiquitous in liquid crystals and is characterized by a rotational symmetry breaking in an otherwise uniform liquid. Recently a similar phenomenon has been observe…