Abstract
Magnetic-field gradients in the mixed state of a type-II superconductor are studied using $^{205}\mathrm{Tl}$ nuclear magnetic resonance (NMR) on ${\mathrm{Tl}}_{2}$${\mathrm{Ba}}_{2}$${\mathrm{Ca}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{10+\mathrm{\ensuremath{\delta}}}$. An anomalous peak was observed in the temperature dependence of the transverse relaxation rate at T/${\mathit{T}}_{\mathit{c}}$\ensuremath{\approxeq}0.25. We attribute this behavior to magnetic-field flucutations from vortex dynamics. We interpret this behavior as a crossover of the principal time scale for vortex dynamics with that of the NMR experiment, approximately 100 \ensuremath{\mu}s. The temperature dependence of this time scale is discussed.
Published Version
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