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 intrinsic reaction to the magnetic field and 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 the 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, parallel to the magnetic field but not lifted by it 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 a real magnet will tend to stay on the edge as all various samples do in our pictures.
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field_theory_of_localization_ahd_supercohductivity-1985.pdf | |
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video- Dominika Radeva
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