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We investigate the hydrostatic pressure dependence of interfacialsuperconductivity occurring at the atomically sharp interface between twonon-superconducting materials: the topological insulator (TI) Bi2Te3 and theparent compound Fe1+yTe of the chalcogenide iron based superconductors. Underpressure, a significant increase in the superconducting transition temperatureTc is observed. We trace the pressure dependence of a superconducting twin gapstructure by Andreev reflection point contact spectroscopy (PCARS), which showsthat a large superconducting gap associated with the interfacialsuperconductivity increases along with Tc. A second smaller gap, which isattributed to proximity-induced superconductivity in the TI layer, increasesfirst, but then reaches a maximum and appears to be gradually suppressed athigher pressure. We interpret our data in the context of a pressure-induceddoping effect of the interface, in which charge is transferred from the TIlayer to the interface and the interfacial superconductivity is enhanced. Thisdemonstrates the important role of the TI in the interfacial superconductivitymechanism.

Reinforcement of interfacial superconductivity in a Bi2Te3/Fe1+yTe heterostructure under hydrostatic pressure