Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs

TT 17.6: Talk

Monday, March 31, 2014, 16:15–16:30, HSZ 201

Planar hybrid Josephson junctions with BaFe_2−xCo_xAs₂ base electrode and a conventional Pb counter electrode using barriers from Au and TiO_x — •Sebastian Döring¹, Stefan Schmidt¹, Manuel Monecke¹, Volker Tympel¹, Frank Schmidl¹, Fritz Kurth², Kazumasa Iida², Ingolf Mönch³, Bernhard Holzapfel^2,4, and Paul Seidel¹ — ¹Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena — ²IFW Dresden, Institut für Metallische Werkstoffe, Helmholtzstraße 20, 01069 Dresden — ³IFW Dresden, Institut für Integrative Nanowissenschaften, Helmholtzstraße 20, 01069 Dresden — ⁴Karlsruhe Institute of Technology, Institut für Technische Physik, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen

We prepared Josephson junctions from BaFe_2−xCo_xAs₂ thin films using photolithography and ion beam etching to pattern the base electrode and sputtering of SiO₂ for the preparation of insulation frameworks. The counter electrode was made from thermally evaporated lead in-situ covered by indium to avoid degradation. As barriers we use sputtered gold layers or additional layers from sputtered and subsequently oxidized titanium, respectively. While for the pure gold barrier we reached an I_cR_n-product of about 18 µV it could be increased to 90 µV using the additional TiO_x layer. The current noise behavior and microwave response of the Josephson junctions could be improved, too.