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Superconducting materials in non-superconducting materials

The researchers wrote: "One way to advance the TCS is to use an artificial or natural interface." ”

"The present study is a clear demonstration of the nonSuperconducting materialsCalcium-iron arsenic compounds, its high TCS can be induced by the antiferromagnetic/metal layer Stacking (metallic layter stacking), and the TCS, which advances in the interface of this compound, supplies the most direct basis to date. ”


So how does it work? Superconductivity can be induced, or even improved, in the interface between two different materials, which was proposed by first in the 1970 's.

However, although many research groups have tried to prove its operating principle, previously arrived in the superconducting experiment, can not rule out the stress effect or chemical doping will not be disturbed experimental results. So the effectiveness of the experiment has never been validated until now.

To verify what had happened, Houston researchers were working under ambient pressure and using pure calcium iron arsenide.

Then they putSuperconducting materialsHeat up to 350 degrees Celsius to reach the so-called annealing (annealing) process. The process is that the material cools slowly after heating.


Because it cools unevenly, this process forms two different phases in the calcium-iron arsenide.

Although these two phases are not superconducting, the panel can detect superconductivity at the coexistence points of these two phases, proving that the interface hypothesis is true.

The calcium-iron-arsenic compound appears to be superconducting at 25 degrees, about 248.15 degrees Celsius. Therefore, it still cannot be used in industry.

But the next step will be to use this same process to find ways to make existing high-temperature superconductors more powerful at these interfaces.

In thisSuperconducting materialsThere is a long way to go before technology is commercialized, but it is a promising step towards developing a cheaper and better superconducting material in the future.

Let's start the suspension train.

The study has now been announced in the Proceedings of the National Academy of Sciences (proceedings Academy of Sciences).


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