Abstract
Data are presented on the temperature-dependent time-logarithmic magnetic relaxation rate S(T) = |dM/din t| of the high-Tc superconductor Tl2CaBa2 Cu2O8. It is found that at low temperatures the relaxation rate has the form S(T) = A(H) exp[(T/T*)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) ∝ I/ηerp2. The measurements of the relaxation rate thus provide information about the effective viscosity ηe of fluxons.
Original language | English (US) |
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Pages (from-to) | 393-401 |
Number of pages | 9 |
Journal | Journal of Low Temperature Physics |
Volume | 97 |
Issue number | 5-6 |
DOIs | |
State | Published - Dec 1 1994 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics