With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The G1 Climax is held by the WWE.
text_B: The Meissner effect is the expulsion of a magnetic field from a superconductor during its transition to the superconducting state .. magnetic field. magnetic field. superconductor. superconductor. The German physicists Walther Meissner and Robert Ochsenfeld discovered this phenomenon in 1933 by measuring the magnetic field distribution outside superconducting tin and lead samples .. magnetic field. magnetic field. Walther Meissner. Walther Meissner. Robert Ochsenfeld. Robert Ochsenfeld. The samples , in the presence of an applied magnetic field , were cooled below their superconducting transition temperature .. magnetic field. magnetic field. superconducting transition temperature. Superconductivity#Superconducting phase transition. Below the transition temperature the samples cancelled nearly all interior magnetic fields .. They detected this effect only indirectly because the magnetic flux is conserved by a superconductor  : when the interior field decreases , the exterior field increases .. superconductor. superconductor. magnetic flux. magnetic flux. The experiment demonstrated for the first time that superconductors were more than just perfect conductors and provided a uniquely defining property of the superconductor state .. superconductor. superconductor. A superconductor with little or no magnetic field within it is said to be in the Meissner state .. magnetic field. magnetic field. superconductor. superconductor. The Meissner state breaks down when the applied magnetic field is too large .. magnetic field. magnetic field. Superconductors can be divided into two classes according to how this breakdown occurs .. In Type I superconductors , superconductivity is abruptly destroyed when the strength of the applied field rises above a critical value Hc .. Depending on the geometry of the sample , one may obtain an intermediate state consisting of a baroque pattern of regions of normal material carrying a magnetic field mixed with regions of superconducting material containing no field .. magnetic field. magnetic field. In Type II superconductors , raising the applied field past a critical value Hc1 leads to a mixed state -LRB- also known as the vortex state -RRB- in which an increasing amount of magnetic flux penetrates the material , but there remains no resistance to the flow of electric current as long as the current is not too large .. magnetic flux. magnetic flux. At a second critical field strength Hc2 , superconductivity is destroyed .. The mixed state is actually caused by vortices in the electronic superfluid , sometimes called fluxons because the flux carried by these vortices is quantized .. quantized. quantum. Most pure elemental superconductors , except niobium and carbon nanotubes , are Type I , while almost all impure and compound superconductors are Type II .. elemental. chemical element. niobium. niobium
not_related.