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Magnetic Susceptibility = [Sum over all n of ({(En1^2)/kT - 2En2} exp {-En0/kT})] divided by [Sum over all n of exp{-En0/kT}]

Where En1 is the first order Zeeman energy (Curie law)

En2 is the second order Zeeman energy (temperature-dependent paramagnetism)

En0 is the zero-order energy (field-independent)

k is Boltzmann's constant

T is temperature

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