In the 1970s, for the first time
physicists introduced the conceptof superconductivity. The theory state that superconductivity could be
induced at the point where two different non-superconductive material are
enjoined, the interface.
Several decade earlier, scientists for the first time demonstrated
the concept of superconductivity. This sudden progress can commercialize the
superconductors in near future.We already demonstrated some of examples of
superconductivity in MRI
Machine and maglev trains.
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| Magnetic Levitation Train |
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| MRI(Magnetic Resonance Imaging) Machine |
"Superconductivity is used in many things,
of which MRI (magnetic resonance imaging) is perhaps the best known," said lead researcher Paul C. W.
Chu from the University of Houston.
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| Paul C. W. Chu--University of Houston |
But superconductor could revolutionise the whole range of other
industries also. It could make our electricity grid more efficient. Right now,
when electricity is transmited from electricity grid to our home it looses 10
persent of the energy on its journey. But superconductivity wouldn't loss any
energy so companies can provide more electricity without producing extra
energy.
One reason to why superconductivity is not commercialize is-
unable to achieve critical temperature at room temperature. Even the best
superconductor have critical temperature of -70 degree celsius , and it is not
efficient according to industrial point of view.
The scientists of University of Houston uses calcium iron
arseinde(CaFeAs2) , a non-superconductor.
"The present work clearly demonstrates
that high Tcs in the well-known non-superconducting compound CaFe2As2 can
be induced by antiferromagnetic/metallic layer stacking and provides the most
direct evidence to date for the interface-enhanced Tcs in this compound," the researchers write.
To
verify what was happening, the Houston researchers worked in ambient pressure
and used undoped calcium iron arsenide.
They
then took the material and heated it to 350 degrees Celsius to achieve a
process known annealing, where the material cools slowly after being heated.
This
process caused two distinct phases in the calcium iron arsenide to occur as it
cools unevenly.
While
neither of those two phases were superconducting, the team was able to detect
superconductivity at the point where the two phases coexist - proving that the
interface hypothesis is real.
The
calcium iron arsenide achieved superconductivity at around 25 Kelvin, which is
roughly –248.15 degrees Celsius, so it's still not going to be of much use for
industry.
Actual
goal is still very far away but it is promising step towards developing cheaper
and efficient superconductor.