Table 1 Values of the exponents β, γ, and δ as determined from the modified Arrott plot, Kouvel-Fischer plot and critical isotherm for Fe₂CrAl, Fe_1.75Mn_0.25CrAl, Fe_1.5Mn_0.5CrAl, and Fe_1.25Mn_0.75CrAl.

Fe₂CrAl

This work

MAP

0.2730

1.34

5.91

202 K

KF plot

0.273 ± 0.01

1.35 ± 0.02

5.94 ± 0.03

CI

–

–

5.69 ± 0.08

Fe_1.75Mn_0.25CrAl

This work

MAP

0.2822

1.42

6.03

120 K

KF plot

0.282 ± 0.02

1.41 ± 0.03

6 ± 0.01

CI

–

–

5.94 ± 0.05

Fe_1.5Mn_0.5CrAl

This work

MAP

0.3281

1.46

5.45

48 K

KF plot

0.326 ± 0.02

1.47 ± 0.05

5.45 ± 0.02

CI

–

–

5.28 ± 0.08

Fe_1.25Mn_0.75CrAl

This work

MAP

0.3474

1.6

5.61

27 K

KF plot

0.345 ± 0.13

1.61 ± 0.04

5.60 ± 0.07

CI

–

–

5.56 ± 0.01

Co₅₀Cr₂₅Al₂₅

¹³

MAP

0.488 (3)

1.144 (4)

3.336 (5)

KF Plot

0.482 (13)

1.148 (16)

3.382(20)

CI

3.401(4)

Co₄₅Ni₅Cr₂₅Al₄₅

¹³

MAP

0.513(7)

1.048(4)

3.043 (7)

KF plot

0.511(7)

1.028 (6)

3.012(8)

CI

2.976 (11)

Co₂TiGe

¹⁶

MAP

0.495

1.325

3.677

KF plot

0.495

1.324(4)

3.675

CI

3.671(1)

Mean field theory

³²

Theory

0.5

1

3

3D Heisenberg model (O*)

³²

Theory

0.365

1.386

4.80

3D Heisenberg model (D*)

³⁹

Theory

0.5

2

5

3D Ising model

³²

Theory

0.325

1.241

4.82

3D XY model

³²

Theory

0.346

1.316

4.81