Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses

Details Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses

2007-05-04

arxiv.org/abs/0705.0667v1

Phys. Rev. Lett. 98, 190401 (2007)

Physics

Quantum Physics

4 pages, 4 color figures, to appear in PRL May 2007

Scientific paper

10.1103/PhysRevLett.98.190401

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.

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