Ferromagnetic Transition of Heisenberg Ferromagnetic Metal of CoS₂ ---Static Critical Properties---

抄録

The static magnetic properties near the Curie temperature in CoS₂ have been thoroughly studied by using various experimental techniques from high quality single crystals, which were grown by the chemical transport technique. A very small anisotropy in magnetization confirms that CoS₂ is the best system to apply the Heisenberg Hamiltonian. The critical indices obey the static scaling hypothesis, which indicates negligible effect of the temperature-induced local moment on the ferromagnetic transition. However, the static critical properties suggest that the magnetic transition is close to the tricritical point, although the magnetic transition in CoS₂ is continuous.