THE N-15 NMR KNIGHT-SHIFT AND ELECTRONIC-STRUCTURE OF SRMOO2.6N0.4 INTHE PAULI PARAMAGNETIC STATE

The temperature-independent part (K0) of the Knight shift, K, of SrMoO 2.6N0.4 in the Pauli paramagnetic state as determined from the N-15 NM R spectrum is K0 = (2.87 +/- 0.01) x 10(-4), with respect to the exter nal solid reference, (15NH4)2SO4. The fit of the spin-lattice relaxati on time, T1, to the Korringa relation confirms that nuclear spin-elect ron spin is the dominant relaxation mechanism. The probability density of conduction electrons, P(f) = 0. 066 angstrom-3, and the density of electron states per unit volume per unit energy for spin-up and -down electrons at the Fermi surface, rho+/-(epsilon0) = 0.87 (eV angstrom3 )-1, were deduced from the experimental results. By combining these da ta with the magnetic susceptibility an electronic structure model of S rMoO2.6N0.4 is proposed. (C) 1994 Academic Press, Inc.