Fig. 5
From: Nematic topological superconducting phase in Nb-doped Bi2Se3

Anisotropy of the temperature dependence of Hc2 of Nb0.25Bi2Se3. Magnetic field applied in-plane along −90° a and 0° b within the trigonal basal plane, and applied perpendicular to the Bi2Se3 basal plane c. Panel d shows the corresponding magnetic field phase diagram. Here the criterion where the resistivity reaches 90% of the normal state resistance was chosen