Heat capacity of magnetite in the range 0.3 to 10 K

Abstract
Heat-capacity measurements are reported for Fe3(1δ) O4 samples with δ=0 and 0.0049 in the range 0.3 to 10 K. Differences in the heat-capacity curves are discussed. The Debye temperatures are 539 and 511 K, respectively; the corresponding exchange integrals as evaluated from Kouvel’s model are JAB=2.35 and 0.604 meV, respectively.