抄録
The itinerant-electron ferromagnet Ni3Al and its carbon-intercalated compounds Ni3AlCx (x=0.01, 0.02, 0.04, 0.05, 0.08, and 0.1) were synthesized and investigated by magnetization measurements between 2 and 300 K with the magnetic field H up to 5 T and 27Al NMR measurements at H=7.4847 T. The Curie temperature is suppressed and disappears only by the carbon intercalation with x=0.02. For the samples with x≤0.02, the T4⁄3-temperature dependence of Ms2 (Ms: spontaneous magnetization) and χ0−1 (χ0: initial susceptibility) are newly observed, being consistent with the predication of the self-consistent renormalization theory of spin fluctuations for weak itinerant ferromagnets. The coupling constant between the 27Al Knight shift and the bulk susceptibility of Ni3AlC0.1 is three times larger than that of Ni3Al, suggesting the drastic change of the electronic state by the carbon intercalation.
