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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all.
Recent research on the complex waveforms of superconductors leads me to the hypothesis that an SDR setup could detect latent superconductivity in a compound.
The effect would be that at some combination of magnetic field, temperature and wideband RF field a phase transition would occur in the complex waveform, such that some frequencies would be absorbed and others boosted. This would unambiguously show that a given material had a superconducting fraction even if it was less than 1/10000th of the bulk and thus allow material improvements to be made.
A variant of this would be a metal detector like device with a strong permanent magnet that would be able to detect superconducting materials in nature by measuring said fields. Any ideas? -A edit: modified due to IP issues, PM me for further information.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Can you explain how these phase transitions "unambiguously" show that a fraction of the material became superconducting? To me, a much more likely explanation is that the resistivity of the whole material changed by a tiny bit.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Similar curves have been documented in Y123 and BSCCO samples from 1987 when HTSC was discovered.
Also with classic magnetoresistive (MR) materials this effect is normally not seen, resistance is linear or logarithmic with changing magnetic field and temperature has much less of an effect.
Spin valve GMR is slightly different, with these you can indeed see steep changes in resistance with a small magnetic field change due to the quantum Hall effect.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Also relevant to this discussion is a new material called tungsten ditelluride (WTe2) which it turns out has "large" magnetoresistance ie it doesn't saturate.
W+Te2 X Y Z angles of electron direction on orbit 121.1553+50.50 = 171.6553=143.853=126.313 54.532+50.50 = 105.032=77.262=59.722 87.843Angles+50.50 = 138.343=110.573=93.033 39.538+50.50 = 90.038=62.268=44.728 72.85+50.50 = 123.35=95.58=78.04 24.54+50.50 = 75.04=47.27=29.73
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Interesting, thanks for sharing.
EDIT: Time to build a prototype and get experimenting. I have been criticized on here for not getting anything built so this will be rectified as soon as possible.
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SDR and superconductivity
