Fig. 2: Disappearance of nematic superconducting domains in SrxBi2Se3 under compressive strain.
From: Uniaxial-strain control of nematic superconductivity in SrxBi2Se3
a b Color polar plot of magnetoresistance for H∥ab measured at the relative strains of Δεxx = 0 (a) and −1.19% (b) with 250 μA applied current and 2.2 K. The light-green regions extending along ±30 and ±150° in a indicate existence of nematic subdomains, which substantially disappears under applied strain (b). The contours are drawn from 0.5 mΩ to 7.5 mΩ in steps of 1 mΩ. c, Table of the 6 possible nematic superconducting states that can exist in the sample as domains. Xn and Yn (n = 0, 1, 2) domains exhibit Δ4x and Δ4y states with the large Hc2 along one of the a axes (ϕab = (60n)°) and a* axes (ϕab = (90 + 60n)°), respectively, as indicated with the red arrows. The crystal structure in the ab plane of Bi2Se3 is shown with the schematic superconducting wave function in its center. The thickness of the blue crescent depicts the superconducting gap amplitude. Source data are provided as a Source Data file.
