Synthesis and Magnetic Properties of Ni_3AlC_x(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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The itinerant-electron ferromagnet Ni_3Al and its carbon-intercalated compounds Ni_3AlC_x (x=0.01, 0.02, 0.04, 0.05, 0.08, and 0.1) were synthesized and investigated by magnetization measurements between 2 and 300K with the magnetic field H up to 5T and ^<27>Al NMR measurements at H=7.4847T. The Curie temperature is suppressed and disappears only by the carbon intercalation with x=0.02. For the samples with x≤0.02, the T^<4/3>-temperature dependence of M^2_s (M_s: spontaneous magnetization) and χ^<-1>_0, (χ_0: 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 ^<27>Al Knight shift and the bulk susceptibility of Ni_3AlC_<0.1> is three times larger than that of Ni_3Al, suggesting the drastic change of the electronic state by the carbon intercalation.
2008-10-15