High temperature superconductors and radiation screening effect?

Hi all.

I was reading the latest article about the latest research on magnesium
diboride with the possibility of using similar materials to achieve Tcs
of above 200K, and suddenly had a thought.

It has been well established that superconductors exclude a magnetic
field, an effect which extends into the realm of radio waves and
visible/infrared light.
So it occurs to me that a simple method of detecting candidate
materials in a bulk sample would be to affix said sample to a Peltier
module with a temperature sensor, with a radio emitter (possibly as
simple as a Gunn diode) and detector assembly to detect changes in
transmission and/or reflection as well as interference patterns.

Even a few parts in a million of a near-room temp material should
affect the transmission of radio signals through the material at the
critical temperature, where an inert sample will have no detectable
effect.

Has anyone published a paper concerning this possibility?

Thanks, -A

.

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