Discussion
In an anti-ferromagnet, susceptibility χ above Neel temperature θ has a form :
Answer: A
Above the Néel temperature the susceptibility has the form \( \chi = \frac{2c}{T + \theta} \), with the paper's constant written as 2c.
In the paramagnetic region an antiferromagnet obeys a Curie-Weiss law with a negative Weiss temperature, \( \chi = \frac{C}{T + \theta} \): the antiparallel exchange opposes alignment, so \( \chi \) stays finite at \( T = \theta \) and peaks at the Néel temperature.
\( \frac{C}{T - \theta} \) is the ferromagnetic Curie-Weiss law, which diverges at the Curie point. The forms \( 2c(T \pm \theta) \) increase with temperature, while a paramagnetic susceptibility falls as T rises.
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