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The superconducting systems emerging from topological insulators upon metalion intercalation or application of high pressure are ideal for investigationof possible topological superconductivity. In this context, Sr-intercalatedBi$_2$Se$_3$ is specially interesting because it displays pressure inducedre-entrant superconductivity where the high pressure phase shows almost twotimes higher $T_c$ than the ambient superconducting phase ( $T_C\sim$ 2.9 K).Interestingly, unlike the ambient phase, the pressure-induced superconductingphase shows strong indication of unconventional superconductivity. However,since the pressure-induced phase remains inaccessible to spectroscopictechniques, the detailed study of the phase remained an unattained goal. Herewe show that the high-pressure phase can be realized under a mesoscopic pointcontact, where transport spectroscopy can be used to probe the spectroscopicproperties of the pressure-induced phase. We find that the point contactjunctions on the high-pressure phase show unusual response to magnetic fieldsupporting the possibility of unconventional superconductivity.

The pressure-enhanced superconducting phase of Sr$_x$-Bi$_2$Se$_3$ probed by hard point contact spectroscopy