Low-temperature specific heats of pseudobinary (a1-xbx)77Si10B13(a, b=Fe, Co, Ni) metallic glasses

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Abstract
Low-temperature specific heats were measured in the temperature range 1.5-6K on 20 metallic glasses in total in the three alloy systems (Fe1-xCox)77Si10B13, (Fe1-xNix)77Si10B13 and (Co1-xNix)77Si10B13. The specific heat is decomposed into three contributions: the electronic specific heat gamma T, the lattice specific heat alpha T3 and the magnetic specific heat Cm. The band structure, as deduced from the concentration dependence of the value of gamma , is found to be quite structureless in comparison with the corresponding behaviour of FCC alloys. The magnetic specific heat depends strongly on the magnetic state involved. The ferromagnetic alloys containing Co exhibit the nuclear specific heat due to the hyperfine interaction of 59Co nuclei with the internal magnetic field. The magnetic specific heat in the spin-glass state is large and its unique temperature dependence can be accounted for in terms of a computer-simulated 'amorphous' spin-glass model.