Ln. Bulaevskii et al., EFFECT OF VORTEX FLUCTUATIONS ON TL-205 SPIN-LATTICE RELAXATION IN THE MIXED-STATE OF TL2BA2CUO6, Physical review letters, 71(12), 1993, pp. 1891-1894
The spin-lattice relaxation rate W on Tl-205 has been measured in the
mixed state of a Tl2Ba2CuO6 aligned powder sample with T(c) = 100 K. A
t T < 25 K, W is-proportional-to T and decreases with increasing magne
tic field. This behavior is explained as caused by fluctuations of pan
cake vortices; the latter induce a time dependent random magnetic fiel
d which causes the relaxation of nuclear spins.