Scalar and anisotropic J interactions in undoped InP: A triple-resonance NMR study

The heteronuclear J-coupling tensor between nearest neighbor (Formula presented) and (Formula presented) spins in undoped InP is investigated by means of (Formula presented) polarization transfer under rapid magic angle spinning (MAS). The scalar contribution can be measured directly and is found to have the value (Formula presented) The principal value of the traceless anisotropic J-coupling tensor (pseudodipolar coupling) is determined to be (Formula presented) or (Formula presented) assuming axial symmetry with the principal axis parallel to the In-P bond. Our values deviate from those reported previously [M. Engelsberg and R. E. Norberg, Phys. Rev. B 5, 3395 (1972)] [based on a moment analysis of the (Formula presented) resonance (Formula presented) and (Formula presented)], but confirm the postulate that the nearest neighbor (Formula presented) magnetic dipolar and pseudodipolar interactions are of the same order of magnitude and partially cancel each other.