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1) What is the domain of applicability of the mentioned equation?

2) A material is ferromagnetic if [itex] \chi \to \infty [/itex]. But the mentioned equation says that this only happens for [itex] T\to T_c [/itex] and below and above [itex] T_c [/itex], there is no ferromagneticity for the material. But in all references, it is said that below [itex] T_c [/itex] there is ferromagneticisty for the material. How can I solve this contradiction?

Thanks