In the ideal regime, the usual ideal-gas behavior is qualitatively recovered. For an ideal gas, in fact, the value of the Landau derivative reduces to the constant value Γ Γ = γ γ + 1 2 , where γ γ is the heat capacity ratio. By definition, γ γ is the ratio between the constant pressure and the constant volume specific heats, so it is larger than 1, leading to a value of Γ Γ larger than 1 too.