Temperature effects paramagnetic susceptibility

The first component xp is the paramagnetic susceptibility, which is due to the coupling of unpaired electrons with the magnetic field and is therefore absent for closed-shell molecules. When present it is much larger than the other two terms and is thus the predominant effect. xp is dependent on temperature and is particularly important in transition-metal chemistry. It will not be discussed further here. 

Fig. 28. Paramagnetic susceptibilities of (a) yttrium and (b) gadolinium ferrogarnets. Solid lines are theoretical curves based on molecular field model and empirically determined molecular field constants. Dashed lines are experimental curves indicating effects of short-range order in the neighborhood of the Curie temperature. (After A16onard (5).)...

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