Y. Lassailly, C. Vettier, et al.
Physica B+C
We have measured the temperature dependence of magnetic relaxation and critical current in an YBaCuO single crystal. Unusually strong time-logarithmic magnetic relaxation is observed. The relaxation rate increases initially with temperature, peaks at ≅25 K and slows down at higher temperatures. The results, interpreted with a thermally activated flux model, yield a low-temperature pinning energy U0≅0.02 eV. This low pinning energy results in an unusually rapid decrease of the critical current as temperature is increased.
Y. Lassailly, C. Vettier, et al.
Physica B+C
H. Maletta, A.P. Malozemoff, et al.
Solid State Communications
G. Kaindl, G. Kalkowski, et al.
Journal of Applied Physics
F. Holtzberg
Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties