373 K SUPERCONDUCTORS
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-There is some  misunderstanding of the MeissnerEffect (see HyperPhysics -with  a wrong one) . In pure form it occurs below the critical field Hc1 =110Gs for YBCO with Tc=93K. Shown here on the left is a  373K sample stabilized by the attraction with its image (approximately-exact only for a semi-infinite  1.4 T magnet). Evidently it has a first critical magnetic field Hc1  larger then 1.4 T. On the right top photograph small magnets stay  similarly in vertical position and  orient N-S. If the pellet below the small magnet is slowly turned in a circle the magnets stay along the same direction N-S and do not turn with the pellet. Usually the YBaCuO samples levitation is shown with strong magnets way above the rather small Hc1 =110Gs. The levitation demos for YBaCuO  (Tc =93 K)  include the effect  of the forces  arising from a complicated system of currents created by  the Abricosov flux lines lattice. 
The top right photo has small magnets on top of 373K superconductors and  one 373K superglass without a magnet with different color.
The bottom right photo show 3 superconductors and one superglass ​ pellet demonstrating their reflectivity difference at room temperature ( about 300 K).
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Reference. arXiv:1603.01482v1 [physics.gen-ph] March, 4,  2016
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The video 1-below is a THz waves generation conducted along  a 10 meters long cable in front of a police detector-3-loud and long signals repeated near the end after the noise. The second video - 2 is a copper tape in series with a superconductor tape of the same size.  The copper tape of thickness 40 microns is blown up by a 137 Amperes current, when the same size tape of 373 K type  superconductor in series remains intact.
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TTTorching diamagnetic samples on the magnet   -
​VIDEO - DOMINIKA RADEVA
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