Abstract
Topological superconductivity is the quantum condensate of paired electrons with an odd parity of the pairing function. By using a Corbino-shape like electrode configuration, we measure the c-axis resistivity of the recently discovered superconductor Sr x Bi2Se3 with the magnetic field rotating within the basal planes, and find clear evidence of two-fold superconductivity. The Laue diffraction measurements on these samples show that the maximum gap direction is either parallel or perpendicular to the main crystallographic axis. This observation is consistent with the theoretical prediction and strongly suggests that Sr x Bi2Se3 is a topological superconductor.
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Du, G., Li, Y., Schneeloch, J. et al. Superconductivity with two-fold symmetry in topological superconductor Sr x Bi2Se3 . Sci. China Phys. Mech. Astron. 60, 037411 (2017). https://doi.org/10.1007/s11433-016-0499-x
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DOI: https://doi.org/10.1007/s11433-016-0499-x