Speedup of nuclear spin diffusion in hyperpolarized solids

We propose a correction to the coefficient of nuclear spin diffusion by a factor 1/root 1 - (p) over bar (2), where (p) over bar is the average nuclear spin polarization. The correction, derived by extending the Lowe-Gade theory to low-temperature cases, implies that transportation of nuclear magnetization through nuclear spin diffusion accelerates when the system is hyperpolarized, whereas for low polarization the correction factor approaches unity and the diffusion coefficient coincides with the conventional diffusion coefficient valid in the high-temperature limit. The proposed scaling of the nuclear spin diffusion coefficient can lead to observable effects in the buildup of nuclear polarization by dynamic nuclear polarization.

Automated summary

The study proposes a correction to the nuclear spin diffusion coefficient by extending the Lowe-Gade theory, indicating that nuclear magnetization transportation accelerates when hyperpolarized and approaches unity for low polarization, coinciding with the conventional diffusion coefficient at high temperatures. This proposed scaling of the nuclear spin diffusion coefficient could have observable effects on the buildup of nuclear polarization by dynamic nuclear polarization.