Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New iron-based and copper-oxide high-temperature

30.05.2008
NIST's neutron facilities reveal intriguing similarities

In the initial studies of a new class of high-temperature superconductors discovered earlier this year, research at the Commerce Department’s National Institute of Standards and Technology (NIST) has revealed that new iron-based superconductors share similar unusual magnetic properties with previously known superconducting copper-oxide materials. The research appears in the May 28 Advanced Online Publication of the journal Nature.

These superconductors may one day enable energy and environmental gains because they could significantly heighten the efficiency of transferring electricity over the electric grid or storing electricity in off-peak hours for later use.

“While we still do not understand how magnetism and superconductivity are related in copper-oxide superconductors,” explains NIST Fellow Jeffrey Lynn at the NIST Center for Neutron Research (NCNR), “our measurements show that the new iron-based materials share what seems to be a critical interplay between magnetism and superconductivity.”

The importance of magnetism to high-temperature superconductors is remarkable because magnetism strongly interferes with conventional low-temperature superconductors. “Only a few magnetic impurities in the low-temperature superconductors sap the superconducting properties away,” says Lynn.

By contrast, copper-oxide superconductors, discovered in 1986, tolerate higher magnetic fields at higher temperatures. The highest performance copper-oxide superconductors conduct electricity without resistance when cooled to "transition temperatures" below 140 Kelvin (-133 Celsius) and can simply and cheaply be cooled by liquid nitrogen to 77 Kelvin or (-196 Celsius).

Japanese researchers discovered earlier this year that a new class of iron-based superconducting materials also had much higher transition temperatures than the conventional low-temperature superconductors. The discovery sent physicists and materials scientists into a renewed frenzy of activity reminiscent of the excitement brought on by the discovery of the first high-temperature superconductors over 20 years ago.

Earlier work on the copper-oxide superconductors revealed that they consist of magnetically active copper-oxygen layers, separated by layers of non-magnetic materials. By “doping,” or adding different elements to the non-magnetic layers of this normally insulating material, researchers can manipulate the magnetism to achieve electrical conduction and then superconductivity.

The group of scientists studying the iron-based superconductors used the NCNR, a facility that uses intense beams of neutral particles called neutrons to probe the atomic and magnetic structure of the new material.

As neutrons probed the iron-based sample supplied by materials scientists in Beijing, they revealed a magnetism that is similar to that found in copper-oxide superconductors, that is, layers of magnetic moments—like many individual bar magnets—interspersed with layers of nonmagnetic material. Lynn notes that the layered atomic structure of the iron-based systems, like the copper-oxide materials, makes it unlikely that these similarities are an accident.

One of the exciting aspects of these new superconductors is that they belong to a comprehensive class of materials where many chemical substitutions are possible. This versatility is already opening up new research avenues to understand the origin of the superconductivity, and should also enable the superconducting properties to be tailored for commercial technologies.

Evelyn Brown | EurekAlert!
Further information:
http://www.nist.gov

More articles from Materials Sciences:

nachricht Electron tomography technique leads to 3-D reconstructions at the nanoscale
24.05.2018 | The Optical Society

nachricht These could revolutionize the world
24.05.2018 | Vanderbilt University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Molecular switch will facilitate the development of pioneering electro-optical devices

A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.

The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

When corals eat plastics

24.05.2018 | Ecology, The Environment and Conservation

Surgery involving ultrasound energy found to treat high blood pressure

24.05.2018 | Medical Engineering

First chip-scale broadband optical system that can sense molecules in the mid-IR

24.05.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>