Effect of carbon substitution on the specific heat of Fe80B20−xCx (0≤x≤8)

The specific heat of ferromagnetic metallic glasses Fe₈₀B_20?xC_x (0≤x≤8) has been measured in the temperature range between 1.5 and 10 K. It is found that the electronic specific heat coefficient is independent of the carbon concentration x. The Debye temperature has a broad peak around x = 4. Both these results are in sharp contrast to the case of FeB binary metallic glasses and could be qualitatively understood in terms of magnetic and structural properties.