Abstract
The recently discovered superconductor provides an alternative and ideal material base for investigating possible topological superconductivity. Here, we report that in , the ambient superconducting phase is gradually depressed upon the application of external pressure. At high pressure, a second superconducting phase emerges at above 6 GPa, with a maximum value of K. The joint investigations of the high-pressure synchrotron x-ray diffraction and electrical transport properties reveal that the reemergence of superconductivity in is closely related to the structural phase transition from an ambient rhombohedral phase to a high-pressure monoclinic phase around 6 GPa, and further to another high-pressure tetragonal phase above 25 GPa.
- Received 9 March 2016
DOI:https://doi.org/10.1103/PhysRevB.93.144514
©2016 American Physical Society