Critical currents in vicinal YBa$_2$Cu$_3$O$_{7-δ}$ films

Details Critical currents in vicinal YBa$_2$Cu$_3$O$_{7-δ}$ films Critical currents in vicinal YBa$_2$Cu$_3$O$_{7-δ}$ films

2004-06-25

arxiv.org/abs/cond-mat/0406620v2

PHYSICAL REVIEW B 70, 214508 (2004)

Physics

Condensed Matter

Superconductivity

10 pages, 12 figures, Submitted to PRB

Scientific paper

10.1103/PhysRevB.70.214508

Most measurements of critical current densities in YBa$_2$Cu$_3$O$_{7-\delta}$ thin films to date have been performed on films where the \textit{c}-axis is grown normal to the film surface. With such films, the analysis of the dependence of $j_c$ on the magnetic field angle is complex. The effects of extrinsic contributions to the angular field dependence of $j_c$, such as the measurement geometry and disposition of pinning centres, are convoluted with those intrinsically due to the anisotropy of the material. As a consequence of this, it is difficult to distinguish between proposed FLL structure models on the basis of angular critical current density measurements on \textit{c}-axis films. Films grown on mis-cut (vicinal) substrates have a reduced measurement symmetry and thus provide a greater insight into the critical current anisotropy. In this paper previous descriptions of the magnetic field angle dependence of $j_c$ in YBa$_2$Cu$_3$O$_{7-\delta}$ are reviewed. Measurements on YBa$_2$Cu$_3$O$_{7-\delta}$ thin films grown on a range of vicinal substrates are presented and the results interpreted in terms of the structure and dimensionality of the FLL in YBa$_2$Cu$_3$O$_{7-\delta}$. There is strong evidence for a transition in the structure of the flux line lattice depending on magnetic field magnitude, orientation and temperature. As a consequence, a simple scaling law can not, by itself, describe the observed critical current anisotropy in YBa$_2$Cu$_3$O$_{7-\delta}$. The experimentally obtained $j_c(\theta)$ behaviour of YBCO is successfully described in terms of a kinked vortex structure for fields applied near parallel to the \textit{a-b} planes.

Affiliated with

Also associated with

No associations

Rating

Critical currents in vicinal YBa$_2$Cu$_3$O$_{7-δ}$ films does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Critical currents in vicinal YBa$_2$Cu$_3$O$_{7-δ}$ films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Critical currents in vicinal YBa$_2$Cu$_3$O$_{7-δ}$ films will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-206120