3 years ago

Revealing the intrinsic anisotropy of superconducting Sr$_x$Bi$_2$Se$_3$.

V.P. Martovitskii, A.Yu. Kuntsevich, E.G. Chizhevskii, Yu.G. Selivanov, V.A. Prudkogliad, M.A. Bryzgalov

We reveal that unusual 2-fold in-plane symmetry of superconductivity, recently explored in Sr- doped topological insulator Bi$_2$Se$_3$, and associated with nematic topological superconductivity, is accompanied by co-aligned features in magnetoresistance well above critical temperature, signifying structural anisotropy of the crystal. Our detailed X-ray diffraction studies of the superconducting crystals do reveal small structural distortions (about 0.02 % elongation in one in-plane crystallographic direction). Additionally, we reveal that the crystal consists of crystallites with high anisotropy in orientation of the crystallite axes. These observations indicate in favor of structural scenario for the apparent nematic superconductivity in this material.

Publisher URL: http://arxiv.org/abs/1801.09287

DOI: arXiv:1801.09287v1

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