Magnetic-field and temperature dependence of the critical current in thin epitaxial films of the high-temperature superconductor YBa2Cu3O7−δ

Abstract

Articles you may be interested inFeatures of the temperature dependence and magnetic-field dependence of the critical current density close to the critical temperature in Y Ba 2 Cu 3 O 7 − δ thin films Low Temp.

Characterization of the thin-film NbN superconductor for single-photon detection by transport measurements

“…Since superconductivity is suppressed at grain boundaries, they provide a pinning potential for vortices and thus may affect SNSPD detector performance. The pinning due to grain boundaries has also been observed experimentally in hightemperature superconductor YBa 2 Cu 3 O 7−δ films, 63 where the dependence of I d on B is similar to that in Fig. 9.…”

“…We use a model for collective breakaway of pinned vortices developed by Fedotov et al 63 For simplicity we further assume square domains in our thin-film NbN. A pinning theory for more general shapes of domains was presented in Ref.…”

Mechanisms of limitation and nature of field dependence of critical current in HTS epitaxial YBaCUO films

“…Using Frank's relationship, the estimated misorientation angle . This extremely low value explains the absence of visual crossover to the LAB transparency mechanism of -limitation [4] at low magnetic fields observed for the pulse-laser deposited film investigated earlier [10].…”

“…4). The parameter taken in the inflection point [10] was estimated to be 0.25, that is higher for the investigated film than it was in [10] . The mean domain size can be estimated from the value of Oe.…”

“…The model developed in [10] for the -limitation by vortex depinning from linear pins is based on the following simplifying assumptions: 1) The only effective pins in the film are out-ofplane edge dislocations within LAB's, which form quasiperiodical chains surrounding a multitude of mosaic domains slightly misoriented to each other. 2) Magnetic induction , where is 2D density of vortices in the film and is the flux quantum, coincides with the external magnetic field applied parallel to the -axis and to the linear pins direction, since the demagnetization factor is practically equal to unity.…”