Soft phonon modes in the vicinity of the structural quantum critical point

Y. J. Hu, Y. W. Cheung, W. C. Yu +5

The quasi-skutterudite superconductors $A_3{T}_4$Sn${}_{13}$ ($A$=Sr, Ca; $T$=Ir, Rh, Co) are highly tunable featuring a structural quantum critical point. We construct a temperature-l…