Fig. 1: Phase diagram of CeAuSb₂ its unusual magnetoresistance.

a Temperature–magnetic field phase diagram of CeAuSb₂. The legend identifies how transition temperatures and fields are obtained. The solid squares, circles, and diamonds indicate the higher transition temperature T_s in three regions. The open squares, circles, and diamonds indicate the lower transition temperature T_N in three regions. The solid triangles indicate the first critical field H_c1 separating single-q and multi-q phases. The open and solid stars indicate the lower and higher second critical fields, respectively. The open up triangles, down triangles, and left triangles indicate T_N in three regions. The sign of the peaks in the derivative are indicated in brackets: N negative, P positive. Colors represent the local exponent, \(n=\partial {\rm{ln}}{{\Delta }}\rho /\partial {\rm{ln}}T\) and Δρ = ρ_ab − ρ₀ = ATⁿ. The contour map shows the presence of three distinct regions in the phase diagram; the green, light-blue, and deep-blue regions denote the single-Q stripe phase (1Q), multi-Q phase (2Q) below \(\tilde{H}\), and multi-Q phase (2Q) above \(\tilde{H}\). Dashed vertical line inside 2Q phase denotes a crossover boundary at \(\tilde{H}\). b Electrical resistivity as a function of applied field along the c-axis. The inset shows an anomaly at the crossover field \(\tilde{H}\). Error bars are smaller than the size of the data points.