Fig. 3: Reversible uniaxial-strain control of the nematic superconductivity.
From: Uniaxial-strain control of nematic superconductivity in SrxBi2Se3
a Upper critical field (Hc2) at 2.2 K along the a axis (x; ϕab = 0°; circles), a* axis (y; ϕab= −90°; upper triangles), c axis (z; lower triangles), as a function of the relative strain Δεxx induced by an applied voltage to the piezostacks. b, In-plane Hc2 anisotropy Hc2∥y/Hc2∥x as a function of strain. At the top of each panel, the estimated actual strain εxx ≃ Δεxx + 0.1% is indicated (see “Methods” section) and the gray region illustrates the possible range in the actual zero strain. The numbers in the top corner of each sub-panel indicates the criteria used for determining Hc2 (see “Methods” section). The numbers in the data points indicate the order of the measurements. The blue and red data points indicate the cases that the measurement was performed after a decrease and increase in strain, respectively. Here, the Hc2 anisotropy varies systematically with external strain. Source data are provided as a Source Data file.
