1. The pressure-enhanced superconducting phase of Sr $$_x$$ x –Bi $$_2$$ 2 Se $$_3$$ 3 probed by hard point contact spectroscopy
- Author
-
Ritesh Kumar, Aastha Vasdev, Shekhar Das, Sandeep Howlader, Karn S. Jat, Prakriti Neha, Satyabrata Patnaik, and Goutam Sheet
- Subjects
Medicine ,Science - Abstract
Abstract The superconducting systems emerging from topological insulators upon metal ion intercalation or application of high pressure are ideal for investigation of possible topological superconductivity. In this context, Sr-intercalated Bi $$_2$$ 2 Se $$_3$$ 3 is specially interesting because it displays pressure induced re-entrant superconductivity where the high pressure phase shows almost two times higher $$T_c$$ T c than the ambient superconducting phase ( $$T_C\sim 2.9$$ T C ∼ 2.9 K). Interestingly, unlike the ambient phase, the pressure-induced superconducting phase shows strong indication of unconventional superconductivity. However, since the pressure-induced phase remains inaccessible to spectroscopic techniques, the detailed study of the phase remained an unattained goal. Here we show that the high-pressure phase can be realized under a mesoscopic point contact, where transport spectroscopy can be used to probe the spectroscopic properties of the pressure-induced phase. We find that the point contact junctions on the high-pressure phase show unusual response to magnetic field supporting the possibility of unconventional superconductivity.
- Published
- 2021
- Full Text
- View/download PDF