TY - JOUR AU - Malisa, Anayesu B PY - 2021/08/31 Y2 - 2024/03/28 TI - Josephson Effect in MgB2/Pd/Nb Trilayer Josephson Junctions JF - Tanzania Journal of Science JA - Tanz. J. Sci. VL - 47 IS - 3 SE - Articles DO - 10.4314/tjs.v47i3.17 UR - https://tjs.udsm.ac.tz/index.php/tjs/article/view/770 SP - 1062-1072 AB - <p>This paper reports fabrication techniques and results of MgB<sub>2</sub>/Pd/Nb trilayer Josephson junctions. The MgB<sub>2</sub> bottom electrode was co-evaporated by molecular beam epitaxy (MBE) technique from both magnesium and boron sources at a low substrate temperature ~ 300 °C, while the interlayer and the top niobium electrode (Pd/Nb bilayer) were deposited <em>ex-situ</em> using RF sputtering. The junctions exhibited &nbsp;and &nbsp;Josephson effect as well as a modulation of the critical current in a magnetic field applied in a direction normal to the junction plane. Fractional and integer Shapiro steps were observed at voltages corresponding to the frequency of the applied microwave radiation field. The &nbsp;products of the junctions compare well with the previously reported values. The results suggest that it should be possible to fabricate all-MgB2 and MgB2 as one of the electrodes Superconductor/Normal/Superconductor (SNS), Superconductor/Insulator/Superconductor (SIS) or even Superconductor/Ferromagnet/Superconductor (SFS) tunnel junctions with interesting characteristics and for various applications.</p><p><strong>Keywords</strong>: MgB<sub>2</sub>, all-MgB<sub>2</sub>, Josephson Tunnel junctions, trilayer devices, Niobium.</p> ER -