Superconducting and normal-state anisotropy of the doped topological insulator Sr0.1 Bi2 Se3

Scientific Reports
M P SmylieU Welp

Abstract

SrxBi2Se3 and the related compounds CuxBi2Se3 and NbxBi2Se3 have attracted considerable interest, as these materials may be realizations of unconventional topological superconductors. Superconductivity with Tc ~3 K in SrxBi2Se3 arises upon intercalation of Sr into the layered topological insulator Bi2Se3. Here we elucidate the anisotropy of the normal and superconducting state of Sr0.1Bi2Se3 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 Sr0.1Bi2Se3 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 SrxBi2Se3.

References

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Citations

Dec 24, 2019·Physical Review Letters·Hiroki UematsuJ A Sauls
Aug 26, 2020·Nature Communications·Ivan KostylevYoshiteru Maeno
Aug 7, 2019·Physical Review Letters·Yue SunTsuyoshi Tamegai
Apr 17, 2021·Science·Yuan CaoPablo Jarillo-Herrero

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Methods Mentioned

BETA
x-ray diffraction

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