Electrodynamics of the antiferromagnetic phase in URu${}_2$Si${}_2$

Jesse S. Hall, M. Rahimi Movassagh, M. N. Wilson +6

We present data on the optical conductivity of URu${}_{2-x}$(Fe,Os)${}_x$Si${}_2$. While the parent material URu${}_2$Si${}_2$ enters the enigmatic hidden order phase below 17.5 K, an an…