论文标题
SR $ _x $ -bi $ _2 $ se $ _3 $ poct of Hard Point接触光谱探测的SR $ _x $ -bi $ _2 $ _2 $ _3
The pressure-enhanced superconducting phase of Sr$_x$-Bi$_2$Se$_3$ probed by hard point contact spectroscopy
论文作者
论文摘要
金属离子插入或高压应用时，从拓扑绝缘体出现的超导系统非常适合研究可能的拓扑超导性。在这种情况下，SR间计算的BI $ _2 $ SE $ _3 $特别有趣，因为它显示压力引起的重新输入超导性，其中高压阶段的高压阶段几乎显示出$ T_C $几乎是环境超导阶段的两倍（$ t_c \ sim $ 2.9 k）。有趣的是，与环境阶段不同，压力诱导的超导阶段表现出非常规超导性的强烈指示。但是，由于压力诱导的相对于光谱技术仍然无法访问，因此对该相的详细研究仍然是一个无关紧要的目标。在这里，我们表明，高压相可以在介观点接触下实现，其中传输光谱可用于探测压力诱导相的光谱特性。我们发现，高压阶段上的点接触连接对磁场表现出了不寻常的响应，支持了非常规超导性的可能性。
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$_2$Se$_3$ is specially interesting because it displays pressure induced re-entrant superconductivity where the high pressure phase shows almost two times higher $T_c$ than the ambient superconducting phase ( $T_C\sim$ 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.
