Superconductivity at Dry Ice Temperatures

-195K Achieved with New Synthesis Method-

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17 July 2008
Superconductors.ORG
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Superconductors.ORG herein reports a method has been developed to
substantially increase the volume fraction of novel superconductor
structures that will not form stoichiometrically. This discovery was
made while trying to increase the volume fraction of the 185K (first
ambient temperature) superconductor announced in March 2008. It had the
unexpected benefit of revealing a theoretical 1256/1212 superconductor
with Tc near 195 Kelvin - a milestone and new world record. The formula
for the 195K superconductor is (Sn1.0Pb0.5In0.5)Ba4Tm6Cu8O22+. Its
1256/1212 structure is shown below left.

The plots at page top show the sharp magnetic and resistive
transitions characteristic of superconductors. Both plots are composites
made from multiple passes that were digitally summed to better resolve
the weak 195K signal.


(to see the graphics and read the rest of the story, click the
below link:)

http://www.superconductors.org/195K.htm