A. Burgstaller et al., NMR PROPERTIES OF HCP RU METAL - 1ST DETECTION OF THE RU-99 AND RU-101 NMR IN A PARAMAGNETIC SOLID, Hyperfine interactions, 80(1-4), 1993, pp. 1015-1018
Results of nuclear magnetic resonance (NMR) measurements on hexagonal
close-packed Ru metal are presented. The field spectra of both isotope
s, having a nuclear spin I of 5/2, show a shape characteristic for qua
drupolar disturbed NMR. From a simulation of these spectra, the electr
ic field gradient V(zz) has been determined to be (37 +/- 0.5) x 10(-1
3) esu/cm3 in agreement with recent band structure calculations. The K
night shift tensor elements deduced from the spectra are K(x) = K(y) =
0.46 +/- 0.02% and K(z) = 0.56 +/- 0.02%. These rather high and posit
ive shifts are completely in line with that of the neighboring element
s in the periodic system and have primarily to be ascribed to the Van
Vleck contribution. This part of the Knight shift is also responsible
for the rather strong anisotropy, that has been found.