Bicrystalline Grain Boundary and Hybrid SNS Junctions Based on Ba-122 Thin Films
arXiv:1211.3879 · doi:10.1109/TASC.2012.2226861
Abstract
To investigate the properties of iron-based superconductors, we examined different kinds of Josephson junctions using Co-doped Ba-122 thin films. Based on bicrystalline SrTiO3 substrates we prepared grain boundary (GB) junctions, which showed clear Josephson effects. We present electrical measurements at varying temperatures and magnetic fields. Furthermore, we prepared hybrid junctions using thin film technique. Confined by a Ba-122 base electrode (S) and a PbIn counter electrode (S') two different geometries of hybrid junctions are formed: a planar SNS' junction with a gold barrier (N) in between and an edge-type junction with an interface-engineered barrier. All three kinds of junctions showed asymmetric resistively shunted junction-like (RSJ) behavior with ICRN products of 20.2 /mu V (GB junctions), 18.4 /mu V (planar SNS' junctions) and 12.3 /mu V (edge-type junctions), respectively. An excess current could be observed at all junctions.
arXiv commentaccepted at IEEE Transactions on Applied Superconductivity
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- Investigation of TiO barriers for their use in hybrid Josephson and tunnelling junctions based on Ba-122 thin films
- Quantum Waveguide Theory of the Josephson effect in Multiband Superconductors
- Preparation of hybrid Josephson junctions on Co-doped Ba-122 single crystals
- BaFe2As2/Fe bilayers with [001]-tilt grain boundary on MgO and SrTiO3 bicrystal substrates