Fig. 5.

Specific heat in normal state. a Temperature dependences of specific heat in the form of $C∕T$ vs $T^2$ in the range of $0<T^2<10$. The results obtained here are consistent with the data in ref. ¹⁵. Note that all the samples show a conventional form of $\frac{C}{T}=\gamma +\beta T^2$ in the normal state. The peak anomaly at low temperature is due to the onset of superconductivity. b Debye temperature ${\Theta }_D$ deduced from $\beta$. Note that ${\Theta }_D$ is almost independent of Al content