Synchrotrons help bring superconductors out of the cold

July 13, 2012 by Victoria Martinez, Canadian Light Source

Dr. Feizhou He observes a sample at the Canadian Light Source beamline where the superconductor data was gathered. Credit: Canadian Light Source Inc.
( -- The longstanding search for a room temperature superconductor is fueled by a tantalizing set of possible applications that sound like science fiction: infinitely long power lines that never lose energy, magnetically levitating trains, and incredibly fast quantum computers.

Superconductors have , the electric equivalent to friction, when cooled below a specified temperature. The temperatures involved are alarmingly low, ranging from a couple of degrees above to a balmy -135°C, still too cold for large scale practical use. Advances in high temperature superconductor research have been slow in part because their physics is poorly understood.

Now an international team of researchers has made a major breakthrough in understanding the limits of these materials. The collaboration, including researchers from the Canadian Light Source, University of Waterloo, and the University of British Columbia, used no less than four synchrotron facilities worldwide in order to confirm their results.

A synchrotron, like Saskatoon’s CLS, where some of the experiments were performed, is a football-field-sized source of brilliant light that enables scientists to study the microstructure and chemical properties of materials

The team found the first experimental evidence that a so-called “charge-density-wave instability” competes with superconductivity. Armed with this knowledge, scientists can start to design new materials that will bring out of the cold and into large-scale real world applications.

“Without very specific evidence it is like theorists are shooting in the dark. Our new data will narrow their target significantly” explained Canadian Light Source scientist Dr. Feizhou He.

The collaboration involved several prominent institutions, including the Max Planck Institute in Germany, Milan Polytechnic University and CNR-SPIN. The results were published this week in the journal Science.

Explore further: Light touch transforms material into a superconductor

More information: … 7/11/science.1223532

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5 / 5 (4) Jul 13, 2012
"The team found the first experimental evidence that a so-called charge-density-wave instability competes with superconductivity."

This was the only relevant piece of the article, and the paper is outside my knowledge. Can anyone else tell me what they found?
5 / 5 (2) Jul 13, 2012
Can anyone else tell me what they found?

I'll try. The real problem is that the future potential for higher temperature superconductors based on this discovery is unknown.

Superconductors "work" by getting electrons to join into Cooper pairs. These pairs follow Bose-Einstein statistics which allow many (or all) of the pairs to be in the same energy state. (Individual electrons, and protons, follow Fermi-Dirac statistics, which only allow two particles in any one state.)

Anyway, when the Cooper pairs form, you have a superconductor. In "high-temperature" copper-based superconductors, the (regular) backbone of copper and oxygen atoms causes/allows Cooper pairs to form at higher temperatures. But what of all those rare earth fractional ratios?

This work shows that there is a competing frequency with a periodicity of ~3.2 lattice units. Apparently the rare earths can suppress this competing frequency. But have the best combinations already been found?

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