Pressure induced re-emergence of superconductivity in superconducting topological insulator Sr0.065Bi2Se3

Yonghui Zhou; Xuliang Chen; Ranran Zhang; Jifeng Shao; Xuefei Wang; Chao An; Ying Zhou; Changyong Park; Wei Tong; Li Pi; Zhaorong Yang; Changjin Zhang; Yuheng Zhang

doi:10.1103/physrevb.93.144514

arXiv · 1604.08293

Pressure induced re-emergence of superconductivity in superconducting topological insulator Sr0.065Bi2Se3

Yonghui Zhou·Xuliang Chen·Ranran Zhang·Jifeng Shao·Xuefei Wang·Chao An·Ying Zhou·Changyong Park·Wei Tong·Li Pi·Zhaorong Yang·Changjin Zhang·Yuheng Zhang

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Abstract

The recent-discovered Sr$_x$Bi$_2$Se$_3$ superconductor provides an alternative and ideal material base for investigating possible topological superconductivity. Here, we report that in Sr$_{0.065}$Bi$_{2}$Se$_3$, the ambient superconducting phase is gradually depressed upon the application of external pressure. At high pressure, a second superconducting phase emerges at above 6 GPa, with a maximum $T_c$ value of $\sim$8.3 K. The joint investigations of the high-pressure synchrotron x-ray diffraction and electrical transport properties reveal that the re-emergence of superconductivity in Sr$_{0.065}$Bi$_{2}$Se$_3$ is closely related to the structural phase transition from ambient rhombohedral phase to high-pressure monoclinic phase around 6 GPa, and further to another high-pressure tetragonal phase above 25 GPa.

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Yonghui Zhou, Xuliang Chen, Ranran Zhang, Jifeng Shao, Xuefei Wang, Chao An, Ying Zhou, Changyong Park, Wei Tong, Li Pi, Zhaorong Yang, Changjin Zhang, Yuheng Zhang. 2016-04-28. Pressure induced re-emergence of superconductivity in superconducting topological insulator Sr0.065Bi2Se3. https://doi.org/10.1103/physrevb.93.144514

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