By Neeraj Khare
Dedicated to the guidance, characterization, and evaluate of HTS digital units, the "Handbook of High-Temperature Superconductor Electronics" presents info on utilizing high-Tc skinny motion pictures and junctions to extend velocity, reduce noise, reduce energy intake and increase higher frequency limits in superconductor electronics. Compiled through a gaggle of the world over popular authors, it discusses the implementation of HTS electronic circuits, microwave filters and subsystems and transition-edge bolometers. different themes contain cryocooler utilization in high-Tc units, HTS skinny movies for digital units, and the fabrication and functions of varied HTS junctions.
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Extra resources for Handbook of High-Temperature Superconductor Electronics (Applied Physics)
Example text
For in situ growth, the kinetics of epitaxial film growth, along with the thermodynamic requirements for proper phase formation, typically require deposition at elevated temperatures (650–800°C) in an oxidizing ambient. The ability to produce relatively smooth film surfaces and synthesize multilayer film structures are obvious advantages with in situ film growth. In situ film-growth techniques that have been successfully employed in the synthesis of epitaxial HTS materials include physical deposition techniques, such coevaporation (7,8), molecular beam epitaxy (9,10), pulsed laser deposition (11), Copyright © 2003 by Marcel Dekker, Inc.
This introduces challenges in developing a flexible conductor from HTS materials. Another issue involves the ability of HTS materials to carry significant currents and remain superconducting in the presence of a magnetic field. As with any type II superconductor, magnetic fields penetrate the HTS cuprates in the form of quantized magnetic field lines. In the presence of an electrical current, microscopic defects are needed to immobilize or “pin” these flux lines against energy-dissipative motion.
High-quality YBa2Cu3O7 films have been obtained by MBE and coevaporation using NO2 (19), O3 (20,50), or atomic oxygen (10,21,48). Molecular oxygen is not effective at the pressures compatible with these techniques. Significant control of the film growth process has been demonstrated with the formation of superconducting YBa2Cu3O7 layers as thin as a single unit cell (50). Large-area YBa2Cu3O7 films with excellent superconducting properties have also been realized. For instance, double-sided YBa2Cu3O7 films on 4-in.