Nmr Line Shape Of Si-29 In Single-Crystal Silicon

We report measurements of the NMR line shape of 4.685% abundant Si-29 in single-crystal silicon for four different crystallographic orientations relative to the applied magnetic field. To avoid significant inhomogeneous broadening, the sample crystals are immersed in a susceptibility-matched liquid and the proton NMR line shape in the liquid is used to measure the residual susceptibility mismatch and to shim the applied field. The observed line shapes are in good agreement with disorder-averaged spin dynamics simulations performed on a 4x4x4 unit-cell lattice with periodic boundary conditions. The splitting of resolved doublet features is used to measure the asymmetry triangle J of the nearest-neighbor indirect dipole or J-coupling tensor, with the result triangle J = 90 +/- 20 Hz. All resolved doublets can be identified with specific nearest-and next-nearest-neighbor isolated spin pairs that occur in the disorder ensemble.