UNUSUAL ON INGREDIENTS CERAMICS offers opportunities for superconductivity
Ceramic materials based on mednokislyh connections allow the development of new high-temperature superconductors, physicists believe from Ohio State University.
The researchers found that the so-called mednokislye ceramic materials serve as a switch between two different types of superconductivity under certain conditions.
The results of studies have been reported in two papers published in recent issues of the journal Physical Review Letters.
Mednokisly material may serve as a very good insulator. And changing its composition is so small that it can be a good superconductor.
This discovery could settle the growing controversy among scientists and to direct the path of buckyball-like superconductivity in ceramics.
Scholars have argued that mednokislye v is a superconductor for the so-called: d-wave or s-wave, explained Thomas Lemberger, a professor of physics.
The difference depends on the electrons within the material are placed. Materials with wave behavior more desirable because they have the best technical properties at high temperatures. Unfortunately, most high-mednokislyh compositions seem to exhibit the behavior of d-wave.
But the wave superconductivity at high temperatures is still possible is the goal of the current study.
For example, buckyballs-like ball-shaped carbon molecules discovered by Bell Labs (the system of research laboratories around the world, created by the company of the same name) in 1991, show the wave superconductivity at 40 degrees Kelvin (-233 | C), - very high temperatures for superconductors. Achieve these limits allowed buckyballs with potassium.
Now Lemberger and his colleagues can change the behavior of a class of compounds mednokislyh, changing the properties of d-wave to s-wave if they will make further in the material enough cerium - the usual ingredient used in creating glassware.
Mechanisms of behavior of both types of materials - a kind of gift. If you make it to the action to suppress one of the behaviors mednokislogo connection, latest automatically switch to the other.
Opening in 1986 mednoksilyh connections puzzled scientists. Ceramics - the usual insulator, but when it is associated with the atoms of elements such as lanthanum and cerium, mednokislye materials suddenly become excellent conductors.
Scientists create thin films mednokislyh compounds, adding thereto varying amounts of cerium and perform observation as sequenced electrons within the material itself. Measurements were made on the basis of an analysis of how deeply the magnetic field can penetrate through each film.
Scientists have speculated on what mednokislye materials can withstand wave superconductivity at temperatures up to 90 Kelvin (-183 | C). This would make the materials useful guides for commercial electronics. If metallic conductors were replaced superconducting ceramics, devices would be more effective, and it would be possible to create a fundamentally new types of devices.
Contact information:
Thomas Lemberger, (614) 292-7799; Lemberger.1 @ osu.edu
