Improved form of static scaling for the nonlinear magnetization in spin glasses

An improved form of static scaling for the nonlinear susceptibility, ${\chi }_{\mathrm{NL}=={\chi }_0\mathrm{-}(\mathrm{M}/\mathrm{H}}$), is given in which the argument of the scaling function is linear in t, i.e., ${\chi }_{\mathrm{NL}\mathrm{\sim }{H}^{2\beta /\phi }\mathrm{G}\mathrm{̃}(\mathrm{t}/H^{2/\phi }}$) with φ=γ+β. This allows for a linear instead of the usual logarithmic-scaling plot and a closer examination of the scaling fit relative to experimental error. Application is made to several spin glasses including ${\mathrm{Cd}}_{0.6}$ ${\mathrm{Mn}}_{0.4}$Te. Significantly lower $T_c$ and larger γ are found compared to previous analyses.