Fig. 3.

Magnetic field dependence of $C/T$ for (A) $x=0$, (B) 0.08, (C) 0.13, and (D) 0.20. Insets show the same data plotted as a function of $\sqrt{{\mu }_{0}H}$. $H\text{*}$ represents a magnetic field at which $C/T$ deviates from $\sqrt{H}$ dependence. The black arrows in the main panels indicate $H\text{*}$. The gray arrow in D indicates upper critical field.