Fig. 2
From: Nematic topological superconducting phase in Nb-doped Bi2Se3
Upper critical field as a function of the in-plane magnetic field orientation of Nb0.25Bi2Se3. The data was determined from the magnetoresistance data in Fig. 1. The critical fields were estimated according to various criteria when the magnetoresistance reaches 50% (squares), 75% (filled circles) and 90% (triangles) of the normal state value. The continuous line corresponds to a theoretical model of nematic superconductivity with a single domain, while the dashed line considers an additional minority phase of ~ 10% volume fraction rotated by 60°, thus causing the additional bump at ~ 30° (see text for details). θ = 0 is the normal direction to the mirror plane within the trigonal basal plane. The inset shows the same data in form of a polar plot
