Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Helping Out a High-Temperature Superconductor

Abstract:
An important step in the drive to create superconductor-based electric and power-delivery devices, such as power transmission lines, motors, and generators

Helping Out a High-Temperature Superconductor

September 15, 2005

Researchers at the U.S. Department of Energy's Brookhaven National Laboratory have discovered a way to significantly increase the amount of electric current carried by a high-temperature superconductor, a material that conducts electricity with no resistance. This is an important step in the drive to create superconductor-based electric and power-delivery devices, such as power transmission lines, motors, and generators. The results are explained in the September 12, 2005, online edition of Applied Physics Letters.

"In theory, superconducting materials can conduct an enormous amount of electric current. But when incorporated into actual devices, certain factors tend to limit the current," said Brookhaven materials scientist Qiang Li, a co-author on the paper. "We studied these factors and found that one, which we call 'substrate roughness,' can actually significantly increase the current-carrying capacity."

The superconducting material studied here consists of the elements yttrium, barium, copper, and oxygen. Dubbed YBCO, it is a member of a class of copper- and oxygen-containing superconductors called "cuprates." Cuprates are "high-temperature" superconductors because they superconduct at temperatures much "warmer" than conventional superconductors (although still very cold) - for example, -300F rather than -440F. This difference, while not huge, is enough to make cuprates more viable for practical applications than materials that must be kept much colder. In many of these applications, YBCO films are deposited onto a 'normal' metal surface (the "substrate"), forming components known as coated conductors. One of the factors widely thought to degrade the performance of coated conductors is the roughness of the metal surface.

To verify this, Li and his colleagues set out to study and measure how the roughness of the substrate affects the current-carrying capacity of YBCO. The researchers deposited a YBCO layer onto a substrate prepared with two distinct areas: a rough, corrugated region with nanometer (billionth-of-a-meter) sized ridges and grooves, and a smooth region. This configuration allowed the group to directly compare the behavior of the YBCO film on both surface types. They were able to do this using electrical-transport measurement techniques, which track the amount of supercurrent passing through the material, and "magneto-optical" imaging, a technique used to study superconductors by following their magnetic behavior.

"What we found is remarkable and surprising," said lead author Zuxin Ye, a graduate student under Li's supervision. "Rather than limiting the current, the nanoscaled corrugated surface produces more than a 30 percent increase in the supercurrent carried by the YBCO films. This suggests that metal substrates with some degree of roughness at the nanoscale might help improve the performance of high-temperature superconductors." The work is the result of a collaboration between scientists in Brookhaven Lab's Materials Science Department, the Condensed Matter Physics group within the Physics Department, and the Lab's Center for Functional Nanomaterials. It was supported by the Office of Basic Energy Sciences within the U.S. Department of Energy's Office of Science.

####

About Brookhaven National Laboratory:
One of the ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. Brookhaven is operated and managed for DOE's Office of Science by Brookhaven Science Associates, a limited-liability company founded by Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.

For more information, visit www.bnl.gov/newsroom

Contact:
BNL Media & Communications
pubaf@bnl.gov
Phone: 631-344-3174 or 2345
Fax: 631-344-3368
Brookhaven National Laboratory
Bldg. 134 PO Box 5000
Upton, NY 11973

Copyright Brookhaven National Laboratory

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Possible Futures

Graphene holds up under high pressure: Used in filtration membranes, ultrathin material could help make desalination more productive April 24th, 2017

Nanoparticle vaccine shows potential as immunotherapy to fight multiple cancer types April 24th, 2017

Russian scientists create new system of concrete building structures: Sientists of Peter the Great Saint-Petersburg Polytechnic University developed a new construction technology April 24th, 2017

Two-dimensional melting of hard spheres experimentally unravelled after 60 years: First definitive experimental evidence of two-dimensional melting of hard spheres April 21st, 2017

Materials/Metamaterials

Graphene holds up under high pressure: Used in filtration membranes, ultrathin material could help make desalination more productive April 24th, 2017

Russian scientists create new system of concrete building structures: Sientists of Peter the Great Saint-Petersburg Polytechnic University developed a new construction technology April 24th, 2017

Two-dimensional melting of hard spheres experimentally unravelled after 60 years: First definitive experimental evidence of two-dimensional melting of hard spheres April 21st, 2017

National Conference on Nanomaterials, (NCN-2017) April 21st, 2017

Announcements

Using light to propel water : With new method, MIT engineers can control and separate fluids on a surface using only visible light April 25th, 2017

Graphene holds up under high pressure: Used in filtration membranes, ultrathin material could help make desalination more productive April 24th, 2017

Nanoparticle vaccine shows potential as immunotherapy to fight multiple cancer types April 24th, 2017

Russian scientists create new system of concrete building structures: Sientists of Peter the Great Saint-Petersburg Polytechnic University developed a new construction technology April 24th, 2017

Energy

Using light to propel water : With new method, MIT engineers can control and separate fluids on a surface using only visible light April 25th, 2017

SUNY Polytechnic Institute Announces Total of 172 Teams Selected to Compete in Solar in Your Community Challenge: Teams from 40 states, plus Washington, DC, 2 Territories, and 4 American Indian Reservations, Will Deploy Solar in Underserved Communities April 20th, 2017

Better living through pressure: Functional nanomaterials made easy April 19th, 2017

Shedding light on the absorption of light by titanium dioxide April 14th, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project