Screening by high-Tcsuperconductors

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Abstract
An analysis is made of the screening of low-frequency magnetic fields by high-Tc superconductors. Screening can occur either through the cumulative effective of a composite of isolated diamagnetic particles, or by the induction of bulk transport currents if the particles are connected. In the former case it is possible to define a screening parameter s=t/ mu a where t is the screen thickness, mu the permeability and a the size of the system. There is only significant screening if the parameter is large. Even when screening is significant demagnetising effects put a rather low limit on the maximum field that can be screened so the conclusion is that screens made up of insulated superconducting particles are likely to be of very limited application.

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