Current dependent reorganization in superconducting Y1Ba2Cu3O7-δ

Transport relaxation measurements and glassy state effects in superconducting MgB2

“…Bold solid line in the inset of Fig. 1 is the calculated curve of an empirical relation of V(t) $ exp(Àt/t o ) which is analogous to glassy state, where t o is the characteristic time [13,14]. As can be seen, there is a reasonable agreement between the data and the exponential relation.…”

Slow voltage oscillations in Ag-doped superconducting Y–Ba–Cu–O

“…We also suggest that coherent voltage oscillations arise from a strong dynamic competition between pinning and depinning process, i.e., the short and long range dynamic correlations between them, which leads to the relaxation effects [5,13]. The flux lines in motion along easy motion channels traverse the sample and leave it regularly for the positive part of BSW current; due to the polarity change, this time, they traverse the sample in opposite edge of the sample by changing the direction of motion which induces a negative voltage along the sample.…”

“…1a and b can be attributed to fast re-organization of transport current and rapid growth of resistive channels along the sample [5,6]. However, the smooth and gradual growth of sample voltage shown in Fig.…”

Flux dynamics and magnetovoltage measurements in a macroscopic cylindrical hole drilled in BSCCO

“…We suggest that the quenched state reorganizes itself over time by evolving to low dissipation levels. Evolving to superconducting state can be attributed to the gradual decrease in the effective size of non-superconducting flow channels over time leading to the enhancement in the superconducting order parameter [6]. In both Figs.…”

“…2 measured for I 2 = 10, 20, and 30 mA may be described by an empirical relation of V(t) $ exp(Àt/t 0 ) a , which is analogous to glassy state, where t o is the characteristic time and the exponent a is a temperature dependent constant [6,7]. It is well known that the glassy state relaxation fits a stretched exponential time dependence of $exp(Àt/t 0 ) a to describe the time decay in the remanent magnetic moment [6,7]. Solid lines in Figs.…”