First-order nuclear dipolar order in rotating solids

TL;DR

This paper introduces a novel method for creating nuclear dipolar order in rotating solids using a combination of dipolar recoupling and adiabatic demagnetization within a specially transformed rotating frame, enhancing control over nuclear spin states.

Contribution

It presents a new approach to generate nuclear dipolar order by employing nested transformations and adiabatic techniques in a nutating frame, advancing the understanding of spin dynamics in rotating solids.

Findings

Successful creation of dipolar order in rotating solids.

Implementation of a new nested transformation technique.

Enhanced control over nuclear spin states in rotating frames.

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, firstly 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 re-introduced 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.