We revealed a pronounced two-fold, in-plane superconducting anisotropy in trigonal Sr0.1Bi2Se3 in the absence of any discernable normal-state anisotropy or crystal lattice distortions.
Significance and Impact
Our results support the conclusion that the two-fold anisotropy is caused by the nematic nodal D4x gap and identify Sr0.1Bi2Se3 as a bulk topological superconductor.
- Angular dependent magneto-transport and magnetization measurements reveal a robust two-fold symmetric superconducting and isotropic normal state.
- High-resolution synchrotron X-ray diffraction confirms an essentially ideal trigonal crystal structure.
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