Table 1.
A summary of the critical exponents of Fe5GeTe2, Fe3-xGeTe2, Cr2Si2Te6, Cr2Ge2Te6 and those predicted by different models (MAP: Modified Arrott plot; KF: Kouvel-Fisher method; CI: critical isotherm analysis).
| Composition | References | Technique | β | γ | δ | {d:n} | J(r) |
|---|---|---|---|---|---|---|---|
| Fe5GeTe2 | This work | MAP | 0.351 (1) | 1.413 (5) | 5.02 (6) | {3:3} | r–4.916 |
| This work | KF | 0.346 (4) | 1.364 (9) | 4.94 (0) | |||
| This work | CI | 5.02 (1) | |||||
| 3D Heisenberg | 4 | Theory | 0.365 | 1.386 | 4.8 | ||
| 3D XY | 4 | Theory | 0.345 | 1.316 | 4.81 | ||
| 3D Ising | 4 | Theory | 0.325 | 1.24 | 4.82 | ||
| Tricritical mean field | 5 | Theory | 0.25 | 1.0 | 5 | ||
| Mean field | 4 | Theory | 0.5 | 1.0 | 3 | ||
| Fe2.64Ge0.87Te2 | 12 | KF | 0.372 (4) | 1.265 (1) | 4.401 (6) | {3:3} | r–4.89 |
| Fe2.85GeTe2 | 13 | KF | 0.363 | 1.228 | 4.398 | r–4.8 | |
| Fe3GeTe2 | 3 | KF | 0.322 (4) | 1.063 (8) | 4.301 (6) | r–4.6 | |
| Cr2Si2Te6 | 14 | KF | 0.175 (9) | 1.562 (9) | 9.925 (5) | {2:1} | r–3.63 |
| Cr2Ge2Te6 | 15 | KF | 0.200 (3) | 1.28 (3) | 7.405 | {2:1} | r–3.52 |