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AssigneeTRW Inc.
InventorsRandy Wayne Simon, Christine Elizabeth Platt, Alfred Euinam Lee, Gregory Steven Lee
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A lanthanum aluminate (LaAlO3) substrate on which thin films of layered perovskite copper oxide superconductors are formed. Lanthanum aluminate, with a pseudo-cubic perovskite crystal structure, has a crystal structure and lattice constant that closely match the crystal structures and lattice constants of the layered perovskite superconductors. Therefore, it promotes epitaxial film growth of the superconductors, with the crystals being oriented in the proper direction for good superconductive electrical properties, such as a high critical current density. In addition, LaAlO3 has good high frequency properties, such as a low loss tangent and low dielectric constant at superconductive temperatures. Finally, lanthanum aluminate does not significantly interact with the superconductors. Lanthanum aluminate can also used to form thin insulating films between the superconductor layers, which allows for the fabrication of a wide variety of superconductor circuit elements.
A layered perovskite superconductor microstrip transmission line comprising:
In a layered perovskite superconductor microstrip transmission line comprising a substrate, a superconductor film on the substrate, an insulator on the conductor, and a superconductive ground on the insulator, the improvement being that at least one of the substrate and the insulator comprises lanthanum aluminate, said superconductor film having a crystalline structure and a lattice constant which substantially matches the crystalline structure and lattice constant of the one substrate and insulator which comprises said lanthanum aluminate and which has no chemical interaction with the one substrate and insulator which comprises lanthanum aluminate.
A layered perovskite superconductor microstrip transmission line comprising:
A superconductor microstrip transmission line comprising:
A superconductor microstrip transmission line comprising:
A layered perovskite superconductor microstrip transmission line in which at least one superconductor film is deposited on a substrate, the substrate being the substrate consisting essentially of lanthanum aluminate, said
A layered perovskite superconductor microstrip transmission line comprising:
A superconductor microstrip transmission line comprising:
A superconductor microstrip transmission line comprising:
A superconductor microstrip transmission line in which at least one superconductor film is deposited on a substrate, the improvement being the substrate consists essentially of lanthanum aluminate having a crystalline structure and a lattice constant that substantially matches the crystalline structure and the lattice constant of the superconductor film, and wherein the crystalline structures are substantially oriented to one another, and there is no chemical interaction between the superconductor film and the substrate.
A layered perovskite superconductor transmission line comprising:
Dependencies are inferred from the claim text.