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Topological superconductivity is one of most fascinating properties oftopological quantum matters that was theoretically proposed and can supportMajorana Fermions at the edge state. Superconductivity was previously realizedin a Cu-intercalated Bi2Se3 topological compound or a Bi2Te3 topologicalcompound at high pressure. Here we report the discovery of superconductivity inthe topological compound Sb2Te3 when pressure was applied. The crystalstructure analysis results reveal that superconductivity at a low-pressurerange occurs at the ambient phase. The Hall coefficient measurements indicatethe change of p-type carriers at a low-pressure range within the ambient phase,into n-type at higher pressures, showing intimate relation to superconductingtransition temperature. The first principle calculations based on experimentalmeasurements of the crystal lattice show that Sb2Te3 retains its Dirac surfacestates within the low-pressure ambient phase where superconductivity wasobserved, which indicates a strong relationship between superconductivity andtopology nature.

Superconductivity in Topological Insulator Sb2Te3 Induced by Pressure