Self-organized current transport through low angle grain boundaries in YBa$_2$Cu$_3$O$_{7-δ}$ thin films, studied magnetometrically

J. R. Thompson; H. J. Kim; C. Cantoni; D. K. Christen; R. Feenstra; D. T. Verebelyi

doi:10.1103/PhysRevB.69.104509

paper

Self-organized current transport through low angle grain boundaries in YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ thin films, studied magnetometrically

arXiv:cond-mat/0308328 · doi:10.1103/PhysRevB.69.104509

Abstract

The critical current density flowing across low angle grain boundaries in YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ thin films has been studied magnetometrically. Films (200 nm thickness) were deposited on SrTiO $_{3}$ bicrystal substrates containing a single [001] tilt boundary, with angles of 2, 3, 5, and 7 degrees, and the films were patterned into rings. Their magnetic moments were measured in applied magnetic fields up to 30 kOe at temperatures of 5 - 95 K; current densities of rings with or without grain boundaries were obtained from a modified critical state model. For rings containing 5 and 7 degree boundaries, the magnetic response depends strongly on the field history, which arises in large part from self-field effects acting on the grain boundary.

8 pages, including 7 figures

Self-organized current transport through low angle grain boundaries in YBa2​Cu3​O7−δ​ thin films, studied magnetometrically

Abstract

Self-organized current transport through low angle grain boundaries in YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ thin films, studied magnetometrically