Specific heat, thermal diffusivity, and thermal conductivity of ${\mathrm{FeF}}_2$ at the Néel temperature

Photopyroelectric simultaneous measurements of the specific heat, thermal diffusivity, and thermal conductivity of single-crystalline ${\mathrm{FeF}}_2$ at the antiferromagnetic-paramagnetic phase transition have been performed. An Ising-like behavior has been found for the specific heat for ‖t‖≤1.2×${10}^{\mathrm{-}2}$, while, in the same reduced-temperature range, the thermal-diffusivity critical behavior has been described according to a dynamic model for a uniaxial system with energy conservation with a critical exponent b=-0.11±0.02. No clear power-law anomaly has been found in the thermal conductivity.