Abstract

We have developed a very large magnetic shielding vessel of high-Tc BiPbSrCaCuO superconductor and experimentally confirmed that this vessel can reduce a weak magnetic field to −100 dB or 1 10 5 . The size of this vessel is 32 cm in diameter, 64 cm in depth and 2.5 cm in thickness. The shielding effect of the vessel does not go down even at such a low frequency as 0.2 Hz. The high attenuation radio in the very low frequency range indicates that magnetic shielding of high-Tc superconductor is promising for neuromagnetic measurements with SQUIDs.

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