Terahertz Lattice Imprint of a Hidden Multipolar Ordering Transition in Gd${}_2$Ru${}_2$O${}_7$

Nicolas M. Kawahala, Rafael L. Sabainsk, Esteban Marulanda +2

Magnetic order carried by higher-rank multipoles produces no net moment and couples only weakly to conventional dipolar probes. Recently, the lattice has been proposed as an altern…