200K Superconductor Tweaked to 212K

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30 November 2008
Superconductors.ORG
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In 1997 theoretical physicists with the Lawrence Berkeley Laboratory at
the University of
California postulated that there should exist an upper limit of the critical
temperature in the
superconducting copper-oxides "in the region of 160-170K"*. Subsequent to 1997
that limit was
increased to 200 Kelvin. Now it appears the limit may need to be raised to 220K
- or higher.

Superconductors.ORG herein reports signs of superconductivity over 212K
by doping a recently-
discovered 200K tin-copper-oxide superconductor with a small amound of indium.
The improved formula
becomes (Sn5In)Ba4Ca2Cu10Oy. Although the 212K phase forms as a very small
volume fraction within
the bulk, sharp resistive and diamagnetic transitions are clearly visible when
multiple tests are
digitally summed together.

[To see the graphics and read the rest of this story, click the below link.]

http://www.superconductors.org/212K.htm