Secular Dipolar Order of Nuclear Spins in Rotating Solids
Phys. Rev. Lett. 135, 188001 – Published 28 October, 2025
DOI: https://doi.org/10.1103/qt29-gskn
Abstract
Nuclear spins’ dipolar order is created under magic angle spinning through the first-order process made possible by simultaneous implementation of dipolar recoupling and adiabatic demagnetization in a reference frame reached out through nested transformations, first from the laboratory frame into the rotating frame, and then into the spin coordinate system nutating inside its parent frame. In such a nutating frame, both the static and resonantly rotating radio-frequency (rf) fields are invisible, and the reintroduced dipolar interaction provides a secular eigenstate on which dipolar order develops with assist of an additional portion of rf field designed to implement adiabatic demagnetization in the nutating frame.