Evolution of the 128-cm−1 Raman phonon mode with temperature in Ba(Fe1– xCo x)2As2 ( x = 0.065 and 0.2)*
Yang Yan-Xinga),b), Gallais Yannb), Fang Zhi-Haoa), Shi Jinga), Xiong Ruia)†
       
Polarization configurations showing the incoming e i, and outgoing e s photon polarizations with respect to the Fe square plane for x 2– y 2 ( B 1g) symmetry.