Fig. 1
From: Broken rotational symmetry on the Fermi surface of a high-Tc superconductor
The angle-dependent magnetoresistance of YBa2Cu3O6.58. The raw resistance (a) as a function of θ at 45 T and 15 K, for several values of ϕ spanning between the â-axis (ϕ = 0°) and\(\hat{{\rm{b}}}\)-axis (ϕ = 90°). The rapid drop in resistivity beyond θ = 60° is due to the onset of superconductivity when insufficient magnetic field is parallel to the ĉ-axis. The inset defines the field angles ϕ and θ with respect to the crystallographic â, \(\hat{{\rm{b}}}\), and ĉ axes. This data was taken at a temperature of 15 K to increase the polar angular range over which the normal resistive state is accessed,64 and to thermally suppress QOs. Broken C4 symmetry is clearly shown in a polar plot of the data b, where the radius is the polar angle θ, and the amplitude and color correspond to the magnitude of the resistance
