Volume 35, Issue 12, December 2009
Index of content:
- SUPERCONDUCTIVITY, INCLUDING HIGH-TEMPERATURE SUPERCONDUCTIVITY
35(2009); http://dx.doi.org/10.1063/1.3272555View Description Hide Description
The resistance of a high-frequency phase-slip line (an ac PSL) in a wide tin film has been experimentally investigated as a function of the external irradiation frequency. It is shown that the behavior of the descending branch of the nonmonotonic frequency dependence of the ac PSL resistance agrees well with the theoretical predictions. The behavior of the ascending branch of this frequency dependence is associated with the nonlinear relaxation processes of the population imbalance of the branches of the quasi-particle spectrum under conditions of microwave pumping at irradiation frequencies greater than the inverse charge-imbalance relaxation time. Comparisons are carried out with the analogous dependences for high-frequency phase-slip centers in narrow channels. The dependences of the penetration depth of a variable longitudinal electric field into a superconductor on the frequency and mean free path of the electrons when they are scattered at impurities are obtained.
35(2009); http://dx.doi.org/10.1063/1.3272557View Description Hide Description
The dynamics of low-density trapped magnetic fluxes, including local fluxes, are investigated in single-crystalYBCO in the region of strong thermal fluctuations near the superconducting phase transition. A substantial difference of the isothermal magnetization-relaxation behavior from the quasi-logarithmic behavior observed earlier in strong magnetic fields is established for the first time. The effective pinning potential in the temperature interval close to the critical temperature is estimated in terms of the simplest model of thermally activated creep.