Fig. 1. (a) The composition dependent Tc in the ternary CrxCoyNi1-x-y (10≤x≤45,10≤y≤60) ternary alloys. TheTc of 300?K and 77?K are marked as dash lines. The position of the CrCoNi MEA is shown as a red star. (b) The calculatedTc with respect to Cr concentration in the ternary CrxCo(100-x)/2Ni(100-x)/2 (20≤x≤30) alloys (indicated by the solid line in (a)), compared to the available experimental data [50].

Fig. 2. The calculated$\gamma _{0}^{\text{fcc}}$, $\gamma _{\text{isf}}^{\text{fcc}}$, $\gamma _{\text{usf}}^{\text{fcc}}$ and $\gamma _{\text{utf}}^{\text{fcc}}$for ternary CrxCoyNi100-x-y (10≤x≤45,10≤y≤60) alloys as a function of Cr and Co concentrations for FM (a, c, e, g) and PM states (b, d, f, h). Results are obtained at the room temperature. TheTc of 300?K is marked by dash lines. The solid lines represent zero values of $\gamma _{0}^{\text{fcc}}$and $\gamma _{\text{isf}}^{\text{fcc}}$in (a-d). The position corresponding to the CrCoNi MEA is indicated by a red star. Available experimental results in ternary alloys are from Refs. [ 13,65].

Fig. 3. Correlation between $\gamma _{0}^{\text{fcc}}$ and $\gamma _{\text{isf}}^{\text{fcc}}$ in ternary Cr-Co-Ni alloys at both PM and FM states. Available experimental SFEs at room temperature [13,[66], [67], [68]] are also potted for comparison (values are listed inTable 1).

Fig. 4. The local magnetic moments (in units of μB) on various atoms for the FM (upper panel) and PM (lower panel) states. The position corresponding to the CrCoNi MEA is indicated by a red star.

Fig. 5. Universal scaling law in ternary Cr-Co-Ni alloys at both PM and FM states.

Fig. 6. The relationship between $\gamma _{\text{isf}}^{\text{fcc}}$and $\gamma _{\text{isf}}^{\text{fcc}}/\gamma _{\text{usf}}^{\text{fcc}}$ for various metals and alloys. Results from current work are indicated by the symbol of blue star and red cross-shaped. Other data from Refs. [13,43,[78], [79], [80], [81], [82], [83]] are included.