%0 Journal Article
%T Superconducting Dome and Crossover to an Insulating State in [Tl4]Tl1-xSnxTe3
%A K. E. Arpino
%A B. D. Wasser
%A T. M. McQueen
%J Physics
%D 2015
%I arXiv
%R 10.1063/1.4913392
%X The structural, superconducting, and electronic phase diagram of [Tl4]Tl1-xSnxTe3 is reported. Magnetization and specific heat measurements show bulk superconductivity exists for 0 < x < 0.4. Resistivity measurements indicate a crossover from a metallic state for low dopings to a doped insulator at x = 1. Universally, there is a large non-Debye specific heat contribution, characterized by an Einstein temperature of {\theta}E ~ 35 K. Density functional theory calculations predict x = 0 to be a topological metal, while x = 1 is a topological crystalline insulator. The disappearance of superconductivity correlates with the transition between these distinct topological states.
%U http://arxiv.org/abs/1502.05059v2