Fig. 3: Planar Hall Effect (PHE) of CeCo2Ga8 at various temperatures.

Measurements were made under fixed magnetic field B = 15 T. \({\rho }_{xz}^{{{{\rm{PHE}}}}}(\varphi )\) profiles at representative temperatures below \({T}_{K}^{on}\): a 80 K; b 40 K; c 25 K; d 20 K; e 17 K; f 14 K; g 10 K; h 5 K. The plume orients along φ ≈ 45° at 80 K. As T decreases, additional oscillations appear, and when T is well below T*, the two-fold oscillations restore with the principal axis along φ ≈ 135°. i Fast Fourier Transform (FFT) spectrum of \({\rho }_{xz}^{{{{\rm{PHE}}}}}(\varphi )\) which gives rise to An, the amplitude of the n-th order of the PHE oscillation. j Left, temperature dependence of A2; right, A4/∣A2∣ and A6/∣A2∣ as functions of T.