Giant conductivity enhancement: Pressure-induced semiconductor-metal phase transition in C d0.90 Z n0.1Te

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Abstract

Element doping and pressure compression may change material properties for improved performance in applications. We report pressure-induced metallization in the semiconductor Cd0.90Zn0.1Te. Transport measurements showed an overall resistivity drop of 11 orders of magnitude under compression up to 12 GPa, which is indicative of a metallization transition. X-ray diffraction measurements revealed that the sample underwent a structural transition from a cubic-F43m phase (zinc blende) to a cubic-Fm3m phase (rock salt) at about 5.5 GPa, followed by another transition to an orthorhombic Cmcm structure at 13 GPa. A huge volume collapse of about 18% was observed during the first phase transition, suggesting a first-order phase transition. The disappearance or weakening of Raman modes, temperature-dependent resistivity, and abinitio calculation results depict the metallic nature of both the rock-salt and Cmcm phases. The band structure changes and increased carrier density (especially at the first structural transition) are likely a consequence of the structural transition.

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Saqib, H., Rahman, S., Errandonea, D., Susilo, R. A., Jorge-Montero, A., Rodríguez-Hernández, P., … Chen, B. (2019). Giant conductivity enhancement: Pressure-induced semiconductor-metal phase transition in C d0.90 Z n0.1Te. Physical Review B, 99(9). https://doi.org/10.1103/PhysRevB.99.094109

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