Abstract
SQUID magnetometer measurements of the magnetic susceptibility (χ|| and χ⊥) of MnF2 have been carried out in the temperature interval 4.2 to 300 K, with special emphasis paid to the region in the immediate vicinity of the Néel point. By combining our data with specific heat data from Teaney (Phys. Rev. Lett. 14, 898, 1965) we have checked the validity of Fisher's relation between the magnetic specific heat Cm and the magnetic parallel susceptibility χ||. Fisher's relation states: Cm/R ≃ K ∂/∂T (χ||T) where K is a factor of proportionality nearly independent of temperature. We find that Fisher's relation is well obeyed in the temperature interval: 2 × 10-4 < | T/TN - 1| < 6 × 10-2
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