Fig. 3: Doping dependencies of the superfluid density and the gap to T_c ratio.

a and b The muon-time spectra of Mo₅Si_3−xP_x (x = 1.2 and 1.4) measured at T = 1.5 K and μ₀H_ap = 50 mT. The solid lines are fits of Eq. (5) to the data. c and d The Fourier transforms of asymmetry spectra are presented in panels (a and b). Red peaks denote the background contribution originating from muons missing the sample. e Temperature evolutions of λ⁻². The solid lines are fits of Eq. (2) to the data. f Doping dependence of λ⁻²(0). g Doping dependence of the gap to T_c ratio α = Δ(0)/k_BT_c. The lines in f and g are guides for the eye. The gray stripe represents the region at x ≃ 1.3, corresponding to an abrupt change of λ⁻²(0) and α. The displayed error bars for parameters obtained from μSR data correspond to one standard deviation from the χ² fits.