Fig. 3: Unconventional in-plane anisotropy of superconductivity in CsV3Sb5.
From: Violation of emergent rotational symmetry in the hexagonal Kagome superconductor CsV3Sb5
a In-plane field-angle ϕ dependence of the upper critical field Hc2. The dotted curve shows the result of fitting using a combination of six- and twofold sinusoidal functions \({H}_{{{{{{{{\rm{c2}}}}}}}}}(\phi )={H}_{{{{{{{{\rm{c2}}}}}}}}}^{(6)}\cos (6\phi )+{H}_{{{{{{{{\rm{c2}}}}}}}}}^{(2)}\sin (2\phi )+{H}_{{{{{{{{\rm{c2}}}}}}}}}^{(0)}\). The error bars represent asymptotic standard errors of Hc2 in the fitting process described in Supplementary Fig. 5. b Relative sixfold component obtained by subtracting \({H}_{{{{{{{{\rm{c2}}}}}}}}}^{(2)}\sin (2\phi )+{H}_{{{{{{{{\rm{c2}}}}}}}}}^{(0)}\) from the data and by normalizing with \({H}_{{{{{{{{\rm{c2}}}}}}}}}^{(0)}\). c Relative twofold anisotropic component of Hc2 obtained by subtracting \({H}_{{{{{{{{\rm{c2}}}}}}}}}^{(6)}\cos (6\phi )+{H}_{{{{{{{{\rm{c2}}}}}}}}}^{(0)}\) from the data and subsequent normalization. d–f Polar plots of the total Hc2 (d), and its sixfold (e), and twofold components (f), illustrating the coexistence of sixfold anisotropy with superconducting nematicity. The broken curves with shadings inside illustrate the results of sinusoidal fittings.
