Josephson Effects in MgB2 Metal Masked Ion Damage Junctions
نویسندگان
چکیده
We have successfully fabricated high quality Josephson junctions in MgB2 thin films by a combination of 30 kV focused Ga ion beam nanolithography and 50 keV proton ion beam irradiation. The junctions show resistively shunted junction like current—voltage characteristics with additional excess current. Monte Carlo simulation results for the optimized mask structure and experimental results for the dc and ac Josephson effects are presented. This technique is particularly useful for prototyping devices due to its simplicity and flexibility of fabrication and has a great potential for high-density integration.
منابع مشابه
High Quality YBa2Cu3O7 Josephson Junctions and Junction Arrays Fabricated by Masked Proton Beam Irradiation Damage
High quality single Josephson junctions and junction arrays with 10 junctions in series have been fabricated using masked proton beam irradiation damage technology. Monte Carlo simulation of the irradiation damage profile underneath the metal mask has been carried out systematically to guide the metal mask structure design. A high resolution and high aspect ratio metal mask opening was fabricat...
متن کاملMultiband model for tunneling in MgB2 junctions
A theoretical model for quasiparticle and Josephson tunneling in multiband superconductors is developed and applied to MgB2-based junctions. The gap functions in different bands in MgB2 are obtained from an extended Eliashberg formalism, using the results of band structure calculations. The temperature and angle dependencies of MgB2 tunneling spectra and the Josephson critical current are calcu...
متن کاملIn situ epitaxial MgB2 thin films for superconducting electronics.
The newly discovered 39-K superconductor MgB2 holds great promise for superconducting electronics. Like the conventional superconductor Nb, MgB2 is a phonon-mediated superconductor, with a relatively long coherence length. These properties make the prospect of fabricating reproducible uniform Josephson junctions, the fundamental element of superconducting circuits, much more favourable for MgB2...
متن کاملThe effect of ion milling on the morphology of ramp-type Josephson junctions
Artificial barriers in Josephson junctions make it possible to change the height and width of the barrier independently. This technique can be realized in high-Tc Josephson junctions using the ramp technique. In this article the fabrication of ramp-type junctions is discussed and the importance of the morphology of the ramp is pointed out. Detailed investigations are described which address the...
متن کاملSub-Micron Thin Film Intrinsic Josephson Junctions
We have fabricated sub-micron intrinsic Josephson junctions in thin films of Tl-Ba-Ca-Cu-O using two differing techniques suited to different applications. By using lateral focussed ion-beam milling we have created arrays of intrinsic junctions in -axis oriented films. Such arrays, with areas as low as 0.25 m, display large hysteresis comparable to that observed in single-crystal intrinsic junc...
متن کامل