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arXiv · 1502.05059

Superconducting Dome and Crossover to an Insulating State in [Tl4]Tl1-xSnxTe3

K. E. Arpino·B. D. Wasser·T. M. McQueen
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Abstract

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 θE ~ 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.

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K. E. Arpino, B. D. Wasser, T. M. McQueen. 2015-02-24. Superconducting Dome and Crossover to an Insulating State in [Tl4]Tl1-xSnxTe3. https://doi.org/10.1063/1.4913392

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