Abstract
Magnetic shielding effects of superconducting Y-Ba-Cu-O vessels have been studied. Magnetic fields inside a Y-Ba-Cu-O vessel in a superconducting state at 77 K were compared with those in a normal state at 290 K by measuring induced voltages in a pick-up coil inside the vessel. The ratio of the magnetic field at 77 K to that at 290 K was as good as 2×10-6 when a magnetic field of 0.03 mT at 1000 Hz was applied to the outside of the vessel. This attenuation ratio is good enough for neuromagnetic measurements with a SQUID magnetometer.
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