Fig. 1

Magnetoresistance of Nb_0.25Bi₂Se₃ as a function of in-plane magnetic field orientation. All data were taken at T = 0.34 K. For clarity, offsets have been added to all data (except at −90°). The orientation of the magnetic field applied strictly parallel to the Bi₂Se₃ basal plane is marked on the right axis. The additional dots mark the points at which the magnetoresistance reaches 75% of the normal state resistance. Inset: zero-field resistivity showing the superconducting transition with onset at 3.2 K