Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New superconductor study confirms, extends Nobel theory

07.11.2003


The behavior of intermetallic superconductors, like the kind used in hospital MRI machines, is even more curious than recent Nobel Prize-winning physicist Alexei Abrikosov had theorized. In newly reported research,* scientists working at the National Institute of Standards and Technology (NIST) Center for Neutron Research have determined that so-called type II superconductors have the equivalent of a multiple personality---at least three distinct physical states, each with its own superconducting behavior. The result should help engineers design new materials for stronger, more efficient superconducting magnets.



Nearly 50 years ago, Abrikosov predicted that superconductors could retain superconductivity in a very strong magnetic field by forming tiny eddies of current. These vortices allow the field to pass through without disrupting the current, until a certain threshold is reached and the resistance-free flow of electrons ceases. Just before the collapse, however, the materials undergo a dramatic spike in current, called the peak effect.

Over a wide range of temperatures and magnetic field strengths, Brown University and NIST scientists tracked the movements of current eddies in a prototype type II superconductor, niobium. Their experiments yielded a phase diagram, a kind of a map that shows how current vortices rearrange in response to changes in temperature and magnetic field.


The study confirmed an earlier set of the team’s findings, but also revealed richer, more complex behavior. The recent work verified that the peak-effect jump in current corresponds to an abrupt change in the vortex arrangement--similar to the transformation that occurs when ice melts. They also provide the first experimental confirmation of Abrikosov’s prediction that a smooth phase transition occurs for conditions that don’t produce the peak effect.

Mark Bello | EurekAlert!
Further information:
http://www.nist.gov

More articles from Studies and Analyses:

nachricht New study: How does Europe become a leading player for software and IT services?
03.04.2017 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)

nachricht Reusable carbon nanotubes could be the water filter of the future, says RIT study
30.03.2017 | Rochester Institute of Technology

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

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

Im Focus: Can the immune system be boosted against Staphylococcus aureus by delivery of messenger RNA?

Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.

Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

How herpesviruses win the footrace against the immune system

26.05.2017 | Life Sciences

Water forms 'spine of hydration' around DNA, group finds

26.05.2017 | Life Sciences

First Juno science results supported by University of Leicester's Jupiter 'forecast'

26.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>