Fig. 5.

Analog of Figs. 3 and 4 for the two-scale Jagla potential. (a) Phase diagram in the vicinity of the liquid–liquid critical point C located at P_c ≈ 0.24 and T_c ≈ 0.37, the line of isobaric specific heat maxima , the line of isothermal compressibility maxima , and the spinodal lines. (b) The T dependence of diffusivity along constant pressure paths. Several paths α and paths β are shown. (i) P = 0.175, 0.200, 0.225 < P_c (paths β in Fig. 1d, along which the system remains in the LDL phase). (ii) P = 0.250, 0.275, 0.30 > P_c (paths α in Fig. 1d, along which the system does not remain in the LDL-like state, but the dynamic behavior changes from Arrhenius to non-Arrhenius). (c) D as a function of 1/T for P = 0.250 (path α). At high temperatures, the fit is Arrhenius D ∼ exp(–1.59/T) (solid line), whereas at low temperatures, the results are consistent with D ∼ (T – T_MCT)^γ with T_MCT ≈ 0.27 and γ ≈ 2.7 (dashed line, also shown in Inset). (d) For P = 0.225 (path β), D is Arrhenius for the entire temperature range and can be fit by D ∼ exp(–1.62/T). The unit of D is a , and the unit of P is U₀/a³.