Phys. Rev. B 50, 16570–16573 (1994)Low-temperature vortex dynamics in a high-temperature superconductorReceived 1 August 1994; published in the issue dated 1 December 1994 Magnetic-field gradients in the mixed state of a type-II superconductor are studied using 205Tl nuclear magnetic resonance (NMR) on Tl2Ba2Ca2Cu3O10+δ. An anomalous peak was observed in the temperature dependence of the transverse relaxation rate at T/Tc≊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 μs. The temperature dependence of this time scale is discussed. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.50.16570
DOI:
10.1103/PhysRevB.50.16570
PACS:
74.25.Nf, 74.40.+k
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