Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses

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.

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

References in corpus (4)

• Dynamical suppression of decoherence in two-state quantum systems
• Coherence Time of a Solid-State Nuclear Qubit
• Anomalies in the NMR of Silicon: Unexpected Spin Echoes in a Dilute Dipolar Solid
• Manifestations of the absence of spin diffusion in multipulse NMR experiments on diluted dipolar solids

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