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

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 $_{3}$ .

Superconducting and normal-state anisotropy of the doped topological insulator Sr $_{0.1}$ Bi $_{2}$ Se $_{3}$

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Superconducting and normal-state anisotropy of the doped topological insulator Sr $_{0.1}$ Bi $_{2}$ Se $_{3}$

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Superconducting and normal-state anisotropy of the doped topological insulator Sr0.10.1​Bi22​Se33​

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Superconducting and normal-state anisotropy of the doped topological insulator Sr0.10.1​Bi22​Se33​

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Superconducting and normal-state anisotropy of the doped topological insulator Sr $_{0.1}$ Bi $_{2}$ Se $_{3}$

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Superconducting and normal-state anisotropy of the doped topological insulator Sr $_{0.1}$ Bi $_{2}$ Se $_{3}$

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