arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.10098cond-mat.supr-con
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硬点接触光谱研究Sr $_x$ -Bi $_2$ Se $_3$的压力增强超导相

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

Ritesh Kumar, Shekhar Das, Aastha Vasdev, Sandeep Howlader, Karn S. Jat, Prakriti Neha, Satyabrata Patnaik, Goutam Sheet

摘要:

拓扑绝缘体在金属离子嵌入或高压作用下形成的超导体系是研究拓扑超导性的理想材料。在这种情况下,Sr插层的Bi $_2$ Se $_3$是特别有趣的,因为它显示出压力诱导的再入超导性,其中高压相显示出比环境超导相($T_C\sim$ 2.9 K)几乎高两倍的$T_c$。有趣的是,与环境相不同,压力诱导超导相显示出非常规超导性的强烈迹象。然而,由于压力引起的阶段仍然无法获得光谱技术,该阶段的详细研究仍然是一个未实现的目标。在这里,我们表明,高压相可以实现下的介观点接触,其中传输光谱可以用来探测压力诱导相的光谱特性。我们发现高压相上的点接触结对磁场有异常的响应,支持了非常规超导的可能性。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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