Abstract

We report 89Y and 17O NMR (9 Tesla) spin echo decay (T2) measurements for YBa2Cu3O7. We correct the results to remove effects of 63,65Cu dipolar coupling in order to isolate effects of vortex dynamics. We confirm vortex localization in the vortex solid state with rms displacements consistent with Langevin dynamical theory, but with motional dynamics at time scales some 106 times slower than predicted.

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