Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New superconducting state verified in experiments

31.03.2008
Superconductors are materials that conduct electrical currents without any loss below a certain temperature. Normally, high magnetic fields destroy the superconductivity, turning the material into a normal conductor.

Novel experiments on organic superconductors revealed a new superconducting phase between the normal conducting and the superconducting state, which was predicted in theory already in 1964. Scientists of the Universities of Geneva/Switzerland, Braunschweig/Germany, Osaka/Japan, and of the Grenoble High Magnetic Field Laboratory in France as well as of the Dresden High Magnetic Field Laboratory of the Forschungszentrum Dresden-Rossendorf were involved in these recent investigations.

Superconductors have no electrical resistance at low temperatures. They are for example applied for magnet coils in magnetic resonance scanners or in particle accelerators. Each superconducting material becomes a normal conductor beyond a certain magnetic field. However, for some materials a new superconducting hybrid phase between the normal and the superconducting state occurs in high magnetic fields and at low temperatures. In this phase, parts of the material stay superconducting whereas other parts turn into the normal-conducting state. Due to this hybrid state the superconductivity can survive also in very high magnetic fields. This state preferably appears in stacked materials that consist of ultra-thin conducting and insulating layers.

Prof. Peter Fulde from the Max Planck Institute for the Physics of Complex Systems in Dresden and Prof. Richard Ferrell predicted the existence of this special superconducting state in 1964. Already at that time it was characterized by a spatial modulation of the superconductivity. At about the same time, two further researchers independently predicted the same phase. Therefore, the state is called Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state.

First successful experiments on an organic superconductor were performed in static magnetic fields at the Grenoble High Magnetic Field Laboratory in 2007. This material was expected to become a normal conductor at about 22 Tesla (Tesla is the unit for the magnetic flux density and a measure for the strength of the magnetic field). But if the magnetic field is applied parallel to the organic molecule layers the superconductivity can survive also in much higher fields due to the formation of the hybrid phase. The results have been published in ‘Physical Review Letters’.

Recently, a second series of experiments has been finished. Again, researchers of the Dresden High Magnetic Field Laboratory at the Forschungszentrum Dresden Rossendorf contributed to these investigations. The hybrid phase was investigated with another method in more detail and also at lower temperatures. Thus, it was possible to observe superconductivity on that material in high magnetic fields up to 32 Tesla.

Christine Bohnet | alfa
Further information:
http://www.fzd.de

More articles from Physics and Astronomy:

nachricht Astronomers find unexpected, dust-obscured star formation in distant galaxy
24.03.2017 | University of Massachusetts at Amherst

nachricht Gravitational wave kicks monster black hole out of galactic core
24.03.2017 | NASA/Goddard Space Flight Center

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

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

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>