Imaging anomalous nematic order and strain in optimally doped BaFe${}_2$(As,P)${}_2$

Eric Thewalt, Ian M. Hayes, James P. Hinton +8

We present the strain and temperature dependence of an anomalous nematic phase in optimally doped BaFe${}_2$(As,P)${}_2$. Polarized ultrafast optical measurements reveal broken 4-fold…