Phonon softening and slowing down of charge-density-wave fluctuations in BaNi${}_2$As${}_2$

Yu Song, Shan Wu, Xiang Chen +7

BaNi${}_2$As${}_2$ is a nonmagnetic analogue of the iron pnictide superconductors, and in its tetragonal state exhibits an incommensurate charge-density-wave (IC-CDW) and a sizable ela…