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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 Eu symmetry in Sr x Bi 2 Se 3 .

Superconducting and normal-state anisotropy of the doped topological insulator Sr0.1Bi2Se3