On the origin of the irreversibility line in thin YBaCuO7 films with and without columnar defects

Abstract

We report on measurements of the angular dependence of the irreversibility temperature $T_{irr}(\theta )$ in $YB{a}_{2}C{u}_3{O}_{7-\delta }$ thin films, defined by the onset of a third harmonic signal and measured by a miniature Hall probe. From the functional form of $T_{irr}(\theta )$ we conclude that the origin of the irreversibility line in unirradiated films is a dynamic crossover from an unpinned to a pinned vortex liquid. In irradiated films the irreversibility temperature is determined by the trapping angle.

19 pages, LaTex, 6 PostScript figures; Author's Homepage: http://www.biu.ac.il:80/~prozorr

References in corpus (2)

• The Flux-Line Lattice in Superconductors
• Universality of Frequency and Field Scaling of the Conductivity Measured by Ac-Susceptibility of a Ybco-Film

Cited by in corpus (1)

• Static and Dynamic irreversible magnetic properties of high temperature superconductors