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US 7,902,119 B2Granted
Porous ceramic high temperature superconductors and method of making same
OwnerJudy Wu, Rose Emergo +2inventors
InventorsJudy Wu, Rose Emergo, Timothy Haugan, Paul Barnes
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Abstract
Porous ceramic superconductors having a film thickness over 0.5 microns are provided. The superconducting material is applied to a vicinal substrate and optionally nanoparticles are inserted to release local strain. The resultant superconductors exhibit improved Jc values compared to nonvicinal (flat) counterparts and those having no nanoparticles.
Claims33
A superconductive device comprising:
- a vicinal substrate;
- a porous superconducting layer overlying said substrate and having a superconducting layer-substrate interface, said superconducting layer having a thickness greater than 0.5 microns, and having a plurality of pores having a tube-like geometry, wherein said pores are formed 30 to 50 nm from the interface and run through several micron thickness.
A method for forming a superconducting device comprising:
- providing a substrate;
- tilting the substrate at an angle greater than zero to provide a vicinal substrate;
- providing a porous superconducting layer with a thickness above 0.5 micron over said vicinal substrate, said superconducting layer formed by alternating a deposition of a superconducting material film with a deposition of nanoparticles of a second material, wherein said porous superconducting layer comprises pores having a tube-like geometry and run through several micron thickness of the film , and wherein said pores are formed 30 to 50 nm from an interface between the superconducting layer and the substrate.
A method for improving the critical current density of a superconducting article having a thickness above 0.5 microns comprising:
- providing a substrate;
- tilting the substrate an angle greater than zero to provide a vicinal substrate;
- depositing a superconducting layer over said vicinal substrate, said superconducting layer having a thickness greater than 0.5 microns and having a plurality of pores having a tube-like geometry, wherein said pores are formed 30 to 50 nm from the interface between the superconducting layer and substrate and run through several micron thickness.
Dependencies are inferred from the claim text.