Abstract
We performed $^{205}\mathrm{Tl}$ NMR on aligned single crystals of the 105-K superconductor ${\mathrm{Tl}}_{2}$${\mathrm{Ba}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8}$ in a field of 4.7 T as a function of angle \ensuremath{\theta} between the field direction and the c axis. Irreversibility temperatures ${\mathrm{T}}_{\mathrm{irr}}$ were determined by comparing the NMR linewidths after field cooling and zero-field cooling. The $^{205}\mathrm{Tl}$ nuclear transverse relaxation rate ${\mathrm{T}}_{2}^{\mathrm{\ensuremath{-}}1}$ shows a well-developed peak caused by vortex motion below ${\mathrm{T}}_{\mathrm{irr}}$. The peak shifts to higher temperatures with increasing \ensuremath{\theta}. The data are analyzed analytically and by computer simulation and the obtained parameters of local vortex motion are discussed.
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