We show that the quasi-skutterudite superconductor SrIr Sn undergoes a structural transition from a simple cubic parent structure, the I phase, to a superlattice variant, the I phase, which has a lattice parameter twice that of the high temperature phase. We argue that the superlattice distortion is associated with a charge density wave transition of the conduction electron system and demonstrate that the superlattice transition temperature T can be suppressed to zero by combining chemical and physical pressure. This enables the first comprehensive investigation of a superlattice quantum phase transition and its interplay with superconductivity in a cubic charge density wave system.
Klintberg, L. E., Goh, S. K., Alireza, P. L., Tompsett, D. A., Logg, P. W., Grosche, F. M., Saines, P. J., Yang, J., Chen, B., & Yoshimura, K. (2012). Pressure- and composition-induced structural quantum phase transition in the cubic superconductor (Sr,Ca)IrSn. Physical Review Letters, 109(23), . https://doi.org/10.1103/PhysRevLett.109.237008