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NMR determination of the partial density of states and of the electronic correlation in Mg1-xAlxB2

We measured the 2 7 Al and 1 1 B NMR spin lattice relaxation rates and the isotropic Knight shifts in powder samples of Mg 1 - x Al x B 2 . The comparison with band structure calculations allows the experimental determination of the partial DOS and its dependence upon the Al concentration x. Agreement is obtained for its absolute values as well as for its behavior upon doping. The satisfactory understanding of the electronic wave function around the probe nuclei validates our determination of a surprisingly large Korringa ratio, from the comparison between 2 7 Al relaxations and shifts, which can only partially be attributed to Al disorder.