Abstract
We investigated the pressure dependence of electric transport and crystal structure of Ag-doped . In the sample prepared by Ag doping of , the Bi atom was partially replaced by Ag, i.e., . X-ray diffraction patterns of measured at 0–30 GPa showed three different structural phases, with rhombohedral, monoclinic, and tetragonal structures forming in turn as pressure increased, and structural phase transitions at 8.8 and 24 GPa. showed no superconductivity down to 2.0 K at 0 GPa, but under pressure, superconductivity suddenly appeared at 11 GPa. The magnetic field () dependence of the superconducting transition temperature was measured at 11 and 20.5 GPa, in order to investigate whether the pressure-induced superconducting phase is explained by either -wave polar model or -wave model.
- Received 26 December 2017
DOI:https://doi.org/10.1103/PhysRevB.97.104503
©2018 American Physical Society