Grain boundary engineering with gold nanoparticles

11th European Conference on Applied Superconductivity

Schmidl, F.^1 ; Katzer, C.^1 ; Michalowski, P.^1 ; Koch, S.^1 ; Tympel, V.^1

Institute of Solid State Physics, Department of Low Temperature Physics, Friedrich-Schiller University Jena, Helmholtzweg 5, Jena

D-07745, Germany^1

关键词: Bicrystal substrates;    Critical temperatures;    Deposition process;    Grain boundary engineering;    Growth conditions;    Light irradiations;    Normal-state resistance;    Single-crystalline;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/4/042037/pdf
DOI  :  10.1088/1742-6596/507/4/042037

来源: IOP

【 摘 要 】

We investigated high-TCgrain boundary Josephson junctions with and without incorporated gold nanoparticles. Pulsed laser deposition was used for the deposition of YBa2Cu3O7-δthin films on SrTiO3bicrystal substrates with different grain boundary angles. During the deposition process, single-crystalline nanoparticles self-assembled from a thin gold layer which was sputtered on the substrate before the YBCO deposition. The interaction between nanoparticles and thin film growth significantly influences the quality of the YBCO films [1]. The critical current density and the critical temperature of the superconducting films can be increased in a defined manner. Furthermore, the nanoparticles influence the growth conditions in the region of the grain boundary and thus the properties of the later patterned Josephson junctions. The comparison between Josephson junctions with and without nanoparticles on the same substrate shows a reduction of the critical current ICand an increase of the normal state resistance RN for all investigated types of grain boundaries in the areas with gold nanoparticles. In some cases we even found an increase of the resulting ICRNproduct. We present the influence of light irradiation on the properties of the Josephson junctions.