Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 10: Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen II

TT 10.11: Vortrag

Dienstag, 25. März 2003, 17:15–17:30, HSZ304

Transport Properties of YBa₂Cu₃O_7−δ Grain Boundaries Above and Below T_c — •Christof Schneider, Stefan Hembacher, German Hammerl, Alexander Weber, Andreas Schmehl, and Jochen Mannhart — Experimentalphysik VI, Institute of Physics, Augsburg University

The mechanisms responsible for the superconducting transport across cuprate grain boundaries have been to a large extend experimentally clarified. Here we mention the d_x²−y² dominated order parameter symmetry, structural effects and bending of the electronic band structure. In contrast there is little knowledge of the grain boundaries’ electronic transport properties above and in the vicinity of T_c, a potential key to understand the physics of interface properties in these complex oxides. In the presentation, first measurements of transport across cuprate grain boundaries between 4.2 and 300 K will be shown and discuss.