Parameters
Observables
|Magnetization|—
Energy/spin—
Susceptibility χ—
T / Tc—
Tc = 2/ln(1+√2) ≈ 2.2692 (Onsager 1944)
Spin lattice with nearest-neighbor coupling. Tune temperature through Tc ≈ 2.269 J/kB to watch the phase transition.