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Title: Ceramic superconductor/metal composite materials employing the superconducting proximity effect

Abstract

Superconducting composite materials having particles of superconducting material disposed in a metal matrix material with a high electron-boson coupling coefficient (.lambda.). The superconducting particles can comprise any type of superconductor including Laves phase materials, Chevrel phase materials, A15 compounds, and perovskite cuprate ceramics. The particles preferably have dimensions of about 10-500 nanometers. The particles preferably have dimensions larger than the superconducting coherence length of the superconducting material. The metal matrix material has a .lambda. greater than 0.2, preferably the .lambda. is much higher than 0.2. The metal matrix material is a good proximity superconductor due to its high .lambda.. When cooled, the superconductor particles cause the metal matrix material to become superconducting due to the proximity effect. In cases where the particles and the metal matrix material are chemically incompatible (i.e., reactive in a way that destroys superconductivity), the particles are provided with a thin protective metal coating. The coating is chemically compatible with the particles and metal matrix material. High Temperature Superconducting (HTS) cuprate ceramic particles are reactive and therefore require a coating of a noble metal resistant to oxidation (e.g., silver, gold). The proximity effect extends through the metal coating. With certain superconductors, non-noble metals can be usedmore » for the coating.« less

Inventors:
 [1]
  1. Manhattan Beach, CA
Publication Date:
Research Org.:
Stanford Univ., CA (United States)
OSTI Identifier:
874586
Patent Number(s):
US 6420318
Assignee:
The Board of Trustees of the Leland Stanford Junior University (Stanford, CA)
DOE Contract Number:  
FG03-86ER45245
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
ceramic; superconductormetal; composite; materials; employing; superconducting; proximity; effect; particles; material; disposed; metal; matrix; electron-boson; coupling; coefficient; lambda; type; superconductor; including; laves; phase; chevrel; a15; compounds; perovskite; cuprate; ceramics; dimensions; 10-500; nanometers; larger; coherence; length; 02; due; cooled; chemically; incompatible; reactive; destroys; superconductivity; provided; protective; coating; compatible; temperature; require; noble; resistant; oxidation; silver; gold; extends; superconductors; non-noble; metals; composite material; superconducting material; noble metal; phase material; metal composite; ceramic superconductor; superconducting composite; omposite materials; /505/29/174/252/428/

Citation Formats

Holcomb, Matthew J. Ceramic superconductor/metal composite materials employing the superconducting proximity effect. United States: N. p., 2002. Web.
Holcomb, Matthew J. Ceramic superconductor/metal composite materials employing the superconducting proximity effect. United States.
Holcomb, Matthew J. Tue . "Ceramic superconductor/metal composite materials employing the superconducting proximity effect". United States. https://www.osti.gov/servlets/purl/874586.
@article{osti_874586,
title = {Ceramic superconductor/metal composite materials employing the superconducting proximity effect},
author = {Holcomb, Matthew J},
abstractNote = {Superconducting composite materials having particles of superconducting material disposed in a metal matrix material with a high electron-boson coupling coefficient (.lambda.). The superconducting particles can comprise any type of superconductor including Laves phase materials, Chevrel phase materials, A15 compounds, and perovskite cuprate ceramics. The particles preferably have dimensions of about 10-500 nanometers. The particles preferably have dimensions larger than the superconducting coherence length of the superconducting material. The metal matrix material has a .lambda. greater than 0.2, preferably the .lambda. is much higher than 0.2. The metal matrix material is a good proximity superconductor due to its high .lambda.. When cooled, the superconductor particles cause the metal matrix material to become superconducting due to the proximity effect. In cases where the particles and the metal matrix material are chemically incompatible (i.e., reactive in a way that destroys superconductivity), the particles are provided with a thin protective metal coating. The coating is chemically compatible with the particles and metal matrix material. High Temperature Superconducting (HTS) cuprate ceramic particles are reactive and therefore require a coating of a noble metal resistant to oxidation (e.g., silver, gold). The proximity effect extends through the metal coating. With certain superconductors, non-noble metals can be used for the coating.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

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