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Both superconductivity and thermoelectricity offer promising prospects fordaily energy efficiency applications. The advancements of thermoelectricmaterials have led to the huge improvement of the thermoelectric figure ofmerit in the past decade. By applying pressure on a highly efficientthermoelectric material Cu$_{3}$Sb$_{0.98}$Al$_{0.02}$Se$_4$, we achievedome-shape superconductivity developing at around 8.5 GPa but having a maximumcritical temperature of 3.2 K at pressure of 12.7 GPa. The novel superconductoris realized through the first-order structural transformation from its initialphase to an orthorhombic one. The superconducting phase is determined in theultimate formation of the Cu-Al-Sb-Se alloy.

Superconductivity in efficient thermoelectric Cu$_3$Sb$_{0.98}$Al$_{0.02}$Se$_4$