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arXiv 1712.03215cond-mat.supr-con
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掺杂拓扑绝缘体Sr $_{0.1}$ Bi $_2$ Se $_3$的超导和正常态各向异性

Superconducting and normal-state anisotropy of the doped topological insulator Sr$_{0.1}$Bi$_2$Se$_3$

M. P. Smylie, K. Willa, H. Claus, A. E. Koshelev, K. W. Song, W. -K. Kwok, Z. Islam, G. D. Gu, J. A. Schneeloch, R. D. Zhong, U. Welp

摘要:

Sr $_x$ Bi $_2$ Se $_3$和相关化合物Cu $_x$ Bi $_2$ Se $_3$和Nb $_x$ Bi $_2$ Se $_3$引起了相当大的兴趣,因为这些材料可以实现非常规拓扑超导体。当Sr嵌入层状拓扑绝缘体Bi $_2$ Se $_3$中时,在Sr $_x$ Bi $_2$ Se $_3$中出现T $_c$ ~ 3 K的超导电性.在这里,我们阐明的各向异性的正常和超导状态的Sr $_{0.1}$ Bi $_2$ Se $_3$与角相关的磁输运和热力学测量。高分辨率X射线衍射研究强调了样品的高结晶质量。我们证明了Sr $_{0.1}$ Bi $_2$ Se $_3$的正常态电子和磁性在基面内是各向同性的,而我们观察到在超导态的上临界场的大的两倍的面内各向异性。我们的结果支持最近提出的奇宇称超导态,其特征是在Sr $_x$ Bi $_2$ Se $_3$中有一个$E_u$对称的节隙.

英文摘要:

Sr$_x$Bi$_2$Se$_3$ and the related compounds Cu$_x$Bi$_2$Se$_3$ and Nb$_x$Bi$_2$Se$_3$ have attracted considerable interest, as these materials may be realizations of unconventional topological superconductors. Superconductivity with T$_c$ ~ 3 K in Sr$_x$Bi$_2$Se$_3$ arises upon intercalation of Sr into the layered topological insulator Bi$_2$Se$_3$. Here we elucidate the anisotropy of the normal and superconducting state of Sr$_{0.1}$Bi$_2$Se$_3$ with angular dependent magnetotransport and thermodynamic measurements. High resolution x-ray diffraction studies underline the high crystalline quality of the samples. We demonstrate that the normal state electronic and magnetic properties of Sr$_{0.1}$Bi$_2$Se$_3$ are isotropic in the basal plane while we observe a large two-fold in-plane anisotropy of the upper critical field in the superconducting state. Our results support the recently proposed odd-parity nematic state characterized by a nodal gap of $E_u$ symmetry in Sr$_x$Bi$_2$Se$_3$.

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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