Topological superconductivity is the quantum condensate of paired electrons with an odd parity of the pairing function. One of the candidates is the triplet pairing superconductor derived from topological insulator Bi2Se3 by chemical doping. Theoretically it was predicted that a two-fold superconducting order parameter may exist in this kind of bulk topological superconductor. Earlier experiments by nuclear magnetic resonance and angle-resolved magnetocaloric measurements seem to support this picture. By using a Corbino-shape like electrode configuration, we measure the c-axis resistivity without the influence of the vortex motion and find clear evidence of two-fold superconductivity in the recently discovered topological superconductor SrxBi2Se3. The Laue diffraction measurements on these samples show that the maximum gap direction is either parallel or perpendicular to the main crystallographic axis.
@article{arxiv.1607.06357,
title = {Superconductivity with two-fold symmetry in topological superconductor SrxBi2Se3},
author = {Guan Du and Yufeng Li and J. Schneeloch and R. D. Zhong and Genda Gu and Huan Yang and Hai-Hu Wen},
journal= {arXiv preprint arXiv:1607.06357},
year = {2017}
}
Comments
21 pages, 6 figures, including the Supplementary Notes