Nuclear Magnetic Resonance and Nuclear-Spin Dynamics in InP

Pulsed- and steady-state nuclear-magnetic-resonance measurements are reported for ${\mathrm{P}}^{31}$ in InP. Measurements on "solid echoes" permit identification of various contributions to the second moment of the resonance. The dominant ${\mathrm{P}}^{31}$-${\mathrm{In}}^{115,113}$ contribution is found to be about a factor of 2 smaller than expected from dipole-dipole interactions alone. A proposed explanation is based on interference between pseudodipolar and dipolar interactions of similar magnitude but opposite sign. The time evolution of the ${\mathrm{P}}^{31}$ magnetization along the effective field in the rotating frame indicates the presence of a significant cross-relaxation effect involving the resonant spin-Zeeman reservoir and the nonresonant spin-spin reservoir.