Abstract
Data are presented on the temperature-dependent time-logarithmic magnetic relaxation rate S(T) = {vert_bar}dM/d ln t{vert_bar} of the high-{Tc} superconductor Tl{sub 2}CaBa{sub 2} Cu{sub 2}O{sub 8}. It is found that at low temperatures the relaxation rate has the form S(T) = A(H) exp[(T/T*){sup 2}], which does not extrapolate to zero at T = 0, thus excluding conventional thermally activated flux creep and providing evidence of quantum vortex tunneling. From a quantum flux tunneling theory, it is shown that S(T) {proportional_to} 1/{eta}{sub e}r{sub p}{sup 2}. The measurements of the relaxation rate thus provide information about the effective viscosity {eta}{sub e} of fluxons.
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