Direct observation of lattice symmetry breaking at the hidden-order transition in URu2Si2

S. Tonegawa, S. Kasahara, T. Fukuda +12

Since the 1985 discovery of the phase transition at $T_{\mathrm{HO}}=17.5$ K in the heavy-fermion metal URu${}_2$Si${}_2$, neither symmetry change in the crystal structure nor magnetic orde…