U Mizutani et al 1987 J. Phys. F: Met. Phys. 17 257 doi:10.1088/0305-4608/17/1/029
U Mizutani, K Fukamichi and T Goto
Show affiliationsLow-temperature specific heats for ten amorphous and four crystalline Co-Y alloys have been measured in the temperature range 1.5-6 K. Both the linearly temperature-dependent specific heat coefficient gamma and the Debye temperature theta D in amorphous and crystalline phases exhibit a sharp increase at the composition where the ferromagnetism collapses. The enhancement in gamma is ascribed to the presence of the linearly temperature-dependent magnetic specific heat, which is often observed in the range where the ferromagnetism becomes unstable. The band-structure profile over a wide composition range is discussed in the light of recent band-structure calculations. The density of states at the Fermi level does not differ appreciably between the amorphous and crystalline phases and decreases gradually with increasing Y content. The internal magnetic field Hint was deduced from the 59Co nuclear specific heat coefficient. The authors found that Hint follows well a linear relationship with the magnetic moment per transition-metal atom.
71.23.Cq Amorphous semiconductors, metallic glasses, glasses
65.60.+a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.
75.30.Cr Saturation moments and magnetic susceptibilities
63.70.+h Statistical mechanics of lattice vibrations and displacive phase transitions
Issue 1 (January 1987)
U Mizutani et al 1987 J. Phys. F: Met. Phys. 17 257
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