We measured the Al-27 and B-11 NMR spin lattice relaxation rates and the isotropic Knight shifts in powder samples of Mg1-xAlxB2, as a function of the Al concentration, x. The temperature independence of the Knight shifts and the linear temperature dependence of the relaxation are verified throughout the compositions explored. The variation with x of the measured quantities is discussed in terms of the projected densities of states at the Fermi energy, finding good qualitative as well as quantitative agreement with recent band structure calculations.
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