Abstract
Similar to Cu(Fe) or Au(V), the Al(Mn) system exhibits at low temperatures a T2 negative dependence of its impurity resistivity. We present NMR data, taken on both 27Al and 55Mn. At helium temperatures, the 55Mn resonance has a big negative Knight shift K = −2.05%. Its spin-lattice relaxation rate is frequency independent, and verifies a Korringa relationship. In high field, the 27Al line is split into a main line and two satellites. The first one with ΔK1/ΔKAl = −1.09 is attributed to first nearest neighbors of Mn. The temperature dependence of the Knight shift of the first Al nearest neighbors is much bigger than expected, and can be described by a (T+θ)−1 law, with θ = 2000±300°K. The fact that low-temperature local susceptibilities are in good agreement with Hartree-Fock theory and that the relaxation rate is frequency independent indicate that the localized spin-fluctuation theory is appropriate to describe that system.
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