Figure 3
(a) R zz at T = 1.40 K and T = 15 K at several angles θ as indicated (15 K curves shifted for clarity). Open black circles indicate the onset of insulating behavior (for T ≤ T EI). (b) Plots of 1/B 0 and \(1/{B}_{0}^{^{\prime} }\) versus cos θ, yielding \({m}^{\ast }{g}^{\ast }\) estimates from the intercept of fits to Equation 1 (green line and dotted lines respectively). The fields at which the inflection point occurs are obtained from the peak in the derivative ∂R zz /∂B (see Supplementary Information). Blue dotted lines are a guide to the eye. (c) A comparison of the field dependence of the energy gap E a (circles with thin black lines indicating the error bars) estimated from thermally activated zz 25 (see Supplementary Information) with the band gap E g (magenta). Open circles connected by a red curve indicate the gap function estimated using \({\rm{\Delta }}=\sqrt{{E}_{{\rm{a}}}^{2}-{E}_{{\rm{g}}}^{2}}\).
