Abstract
For strongly ferromagnetic or antiferromagnetic alloys, as well as nonmagnetic alloys, the γ values determined by low temperature specific heat measurements correlate quite well with the electron concentration. These values may be considered as representative of the electronic specific heat of the alloys concerned. From them the approximate shape of the d-band was determined for f.c.c. alloys in the electron concentration range 7 to 10 e/ a. However, for alloys known from magnetic measurements to have a complex magnetic structure (such as long range ferromagnetism with superimposed short range antiferromagnetism), γ does not correlate with the electron concentration. As shown for disordered MnNi 3 by specific heat measurements after magnetic cooling to 1·4°K, in such cases γ comprises, in addition to the electronic specific heat, a magnetic contribution, which is in some cases very large.
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