Ceramic superconductor/metal composite materials employing the superconducting proximity effect
- Manhattan Beach, CA
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.
- Research Organization:
- Stanford Univ., CA (United States)
- DOE Contract Number:
- FG03-86ER45245
- Assignee:
- The Board of Trustees of the Leland Stanford Junior University (Stanford, CA)
- Patent Number(s):
- US 6420318
- OSTI ID:
- 874586
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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/