Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses
Quantum Physics
2007-05-23 v1 Mesoscale and Nanoscale Physics
Abstract
NMR spin echo measurements of C-13 in C60, Y-89 in Y2O3, and Si-29 in silicon are shown to defy conventional expectations when more that one pi pulse is used. Multiple pi-pulse echo trains may either freeze our or accelerate the decay of the signal, depending on the pi-pulse phase. Average Hamiltonian theory, combined with exact quantum calculations, reveals an intrinsic cause for these coherent phenomena: the dipolar coupling has a many-body effect during any real, finite pulse.
Cite
@article{arxiv.0705.0667,
title = {Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses},
author = {Dale Li and A. E. Dementyev and Yanqun Dong and R. G. Ramos and S. E. Barrett},
journal= {arXiv preprint arXiv:0705.0667},
year = {2007}
}