Below is a photo of a burned copper tape and a longer but intact 373K superconducting tape both after passing in series 250 Ampers current in a demo from year 2014. Also there is a reply to a publication with the link for it mentioning more details of the 373K Superconducting materials. Few lines from the reply- "Any attempt to assign or introduce the ferromagnetic, or anti, or variations of both in the discussion is incorrect. Well, there is no discussion-not a single scientific response to the article "373K Superconductors"- article (arxiv:( 1603.01482) -only few want me to give them the technology- and -" too high Tc" one colleague told me. There are higher, I mentioned to an other colleague, but he was not interested? All this after many conferences and books and a question addressing the future -100 years from year 2000. “Do you use room temperature superconductors?"-to our colleague, who asked -373K Superconductors is using them as shown below.
WHY?- THE 373K SUPERCONDUCTORS ARTICLE -ARXIV:1603.01482v1 was downloaded by more then 26000 physicists - colleagues scientists and others interested but it is disregarded without a single critical argument ? THE ANSWER IS VERY SIMPLE -IT HAS BEEN WRONGLY ASSUMED THAT All SUPERCONDUCTORS MUST LEVITATE IN ABOUT 1.4 T STRONG MAGNETIC FIELD. THE LEVITATION, HOWEVER, IS NOT A MEISSNER EFFECT AT ALL- LEVITATING SAMPLES ARE FLOATING PERPENDICULAR TO THE MAGNETIC FIELD, WHILE THE MAGNETIC FIELD IS TANGENTIAL TO THE SURFACE OF THE SUPERCONDUCTOR IN THE MEISSNER EFFECT. THE FLOATING IN MAGNETIC FIELD FROGS MAKE LEVITATION NOT RELIABLE SUPERCONDUCTIVITY TEST AT ALL -see HyperPhysics-? for a wrong explanation. To avoid more confusions here is the proof: Assume that a sample has rather high first critical magnetic field Hc1. The magnetic field will not be able to penetrate it. It creates a system of surface currents determined by the shape and size of the sample and creates a "shield" blocking the penetration of the magnetic field. Let the sample be left on a thin horizontal sheet insensitive to the magnetic field. Let the sample be small and spherical to avoid complications related to the size and shape of the object. Assume the magnetic field to be homogeneous. In this conditions the force acting on the sphere will be the same as one created by the attraction of the sphere and its image below the sample, but with opposite direction of the surface currents induced in the real sample. In effect the two-the object and its image will attract each other. The result is that the Meissner effect can be described as attraction between the sphere and its image and this attraction will hold it vertical but not lifted by the magnetic field and there will be no high levitation in the conditions described here. In fact the sphere will be in the air, ( if it is not made of heavy elements like Osmium*-Os-density 22.6 g/cc) but still attached to the surface. Оf course a sphere will not show any change in its position in this conditions, but a thin disk will be upright and that is shown in our video. A sphere on the magnet will tend to stay on the edge as all various samples do in our pictures.
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video- Dominika Radeva