Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New Superconductor Research May Solve Key Problem in Physics

16.07.2010
Binghamton University physicist Michael Lawler and his colleagues have made a breakthrough that could lead to advances in superconductors. Their findings will be published this week in the prestigious British journal Nature.

The data Lawler analyzed have been available for several years, but have not been well understood until now. “The pattern looked so mysterious and interesting,” he said. “It’s so different from any other material we’ve ever looked at. Trying to understand what this data is really trying to tell us has been one of our big ambitions, and we think we have captured one of its essential ingredients.”

Lawler, a theoretical physicist, worked with physicists at Cornell University, Brookhaven National Laboratory and laboratories in Japan and Korea on this research. They found what may be the key to unlocking the secrets of the so-called “pseudogap phenomenon” in superconductors.


The “pseudogap phenomenon” is the remarkable vanishing of the low-energy electronic excitations in high-temperature superconductors. A material experiencing this rare phenomenon becomes mostly insulating but otherwise behaves like a superconductor. And because this can happen at room temperature, scientists believe it may be possible for superconductivity to exist at these temperatures.

Superconductors are materials – often but not always metals – that conduct electricity without resistance below a certain temperature. For decades, it was thought that these materials could conduct electricity only at temperatures far below freezing. In the last 20 years, however, scientists have discovered several compounds that superconduct at much higher temperatures.

In principle, a room-temperature superconductor could allow:
- Electricity to travel with zero energy loss from power plants to houses.
- High-speed trains to float on top of the superconductor.
- Cell phone towers that could handle many cell phone carriers in high-population areas.

"It’s one of the most interesting problems that we have in physics,” Lawler said. “I believe that having a challenge at that level can help produce breakthroughs in science.”

He and his colleagues found that the electronic states of two neighboring oxygen atoms in these superconductors are different from each other. Looking at the electronic structure, then, the physicists were able to observe a broken symmetry. “It is like the electronic states were stretched along the X-direction compared to the Y-direction,” Lawler said. “That the pseudogap phase has this order allows us to make the bold claim that it is actually a distinct phase of electronic matter.”

To understand this observation better, consider the phases of rod-like objects. Rod-like polymers have many more phases than the solid, liquid and gas phases of more ordinary atoms. At high temperatures, they are in a gas phase like such atoms. However, at lower temperatures, all the rods can point in one direction while still moving around freely like a gas or liquid. Physicists call this a “nematic phase.” The organization of the rods in this phase is similar to what the researchers observed in the electronic states associated with the pseudogap phenomena.

More phases of rod-like objects exist at lower temperatures until eventually the rods freeze into a crystal. Physicists call these intermediate phases "liquid-crystal phases." They are responsible for the liquid crystal displays commonly used in watches and televisions.

Lawler, who joined Binghamton’s faculty in 2008, earned his PhD at the University of Illinois at Urbana-Champaign and was a postdoctoral scholar at the University of Toronto. A self-described “pencil-and-paper theorist,” he is open to discovery in unexpected places. That was certainly the case with this project, as the inspiration for the data analysis came to him while he was shopping at Home Depot.

The researchers’ success, Lawler said, is owed to both the unusual data analysis—which is derived from radio technology – and the unique capabilities of his Cornell colleagues, who have a scanning tunneling microscope that enables them to look at single atoms while maintaining a large field of view.



Ryan Yarosh | Newswise Science News
Further information:
http://www.binghamton.edu

More articles from Physics and Astronomy:

nachricht Electrocatalysis can advance green transition
23.01.2017 | Technical University of Denmark

nachricht Quantum optical sensor for the first time tested in space – with a laser system from Berlin
23.01.2017 | Ferdinand-Braun-Institut Leibniz-Institut für Höchstfrequenztechnik

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: Quantum optical sensor for the first time tested in space – with a laser system from Berlin

For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.

According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Tracking movement of immune cells identifies key first steps in inflammatory arthritis

23.01.2017 | Health and Medicine

Electrocatalysis can advance green transition

23.01.2017 | Physics and Astronomy

New technology for mass-production of complex molded composite components

23.01.2017 | Process Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>