MM and sub-MM properties of ramp-type Josephson junctions on MgO with STO buffer layers
| Autor: | J. Chen, L. Amatuni, A.H. Sonnenberg, Tsutomu Yamashita, Horst Rogalla, H. Myoren, G.J. Gerritsma |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Josephson effect
Josephson junctions High-temperature superconductivity Materials science Substrates Condensed matter physics Atomic force microscopy Analytical chemistry Sputtering High temperature superconductors Substrate (electronics) Sputter etching Condensed Matter Physics Buffer (optical fiber) Superconducting epitaxial layers Electronic Optical and Magnetic Materials law.invention Fabrication law Atomic force microscopy (AFM) Buffer layers Irradiation Electrical and Electronic Engineering Surface morphology Layer (electronics) |
| Zdroj: | IEEE transactions on applied superconductivity, 9(2), 3854-3857. IEEE |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/77.783868 |
| Popis: | We have successfully fabricated ramp-type junctions on MgO substrates using an SrTiO/sub 3/ (STO) buffer layer. The observed I/sub c/R/sub n/ product for the junctions on MgO with STO buffer layer were about 2 mV at 4.2 K and 0.1 mV at 60 K. The junctions clearly showed Shapiro steps under irradiation of MM-waves and sub-MM-waves. We observed Josephson emission at 50 GHz from a junction on a MgO substrate with STO buffer layer at 17 K. We have also confirmed mixing in the self-oscillating mode using MM-wave and sub-MM-wave signals. |
| Databáze: | OpenAIRE |
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