Superconductivity in HfTe₅ across weak to strong topological insulator transition induced via pressures.

ABSTRACT: Recently, theoretical studies show that layered HfTe₅ is at the boundary of weak &strong topological insulator (TI) and might crossover to a Dirac semimetal state by changing lattice parameters. The topological properties of 3D stacked HfTe₅ are expected hence to be sensitive to pressures tuning. Here, we report pressure induced phase evolution in both electronic &crystal structures for HfTe₅ with a culmination of pressure induced superconductivity. Our experiments indicated that the temperature for anomaly resistance peak (Tp) due to Lifshitz transition decreases first before climbs up to a maximum with pressure while the Tp minimum corresponds to the transition from a weak TI to strong TI. The HfTe₅ crystal becomes superconductive above ~5.5 GP

SUBMITTER: Liu Y 

PROVIDER: S-EPMC5353664 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature