Effect of ac susceptibility in superconductors on magnetic shielding

Maruyama, M.; Hidaka, M.; Satoh, T.
April 2003
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2868
Academic Journal
We have theoretically studied the effect of ac susceptibility in superconductors on magnetic shielding. Our recent study of measured wave form distortion observed in a high-T[SUBc] superconductor sampler system suggests that the magnetic field leaks into the sampler circuit through the Yba[SUB2]Cu[SUB3]O[SUB7-x] ground plane when an ac magnetic field is applied. The occurrence of such magnetic leakage can be explained by complex susceptibility in the ground plane because a shielding magnetic field with a phase shifted due to an imaginary part of the susceptibility cannot cancel an applied ac magnetic field completely. A simple calculation shows that the residual magnetic field should have an advanced phase of 45°-90°, which coincides with the results obtained in the sampler system.


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