Abstract
WITH the advent of high-temperature superconductivity, the search is on for applications of these materials. Here we outline a new method for the separation of paramagnetic and diamagnetic molecules using the repulsive interaction between a magnetic dipole and a micro-cavity in a ceramic material which is in the superconducting state. We present experiments of the permeation of air through YBa2Cu3O7−δ and through Bi1.8Pb0.2Ca2Sr2Cu3Ox ceramic pellets. These experiments show the preferential permeability of nitrogen compared with that of oxygen in the diamagnetic state of the superconductors below the critical transition temperature, Tc. This effect is quenched by the application of a large enough external magnetic field. As far as we know it is the first application of the porosity of the ceramic superconductors.
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