Abstract
Abstract High-T c rf-SQUID magnetometer with 77K equivalent flux noise of 2×10 −4 (φ 0 ·Hz − 1 2 ) for (10 0 –10 2 ) Hz was used to study high-T c crystals and ceramic magnetic moment in a field range of (10 −3 –10 0 )G near and on the transition curve at T T c ≥ 0.85 . Difference between crystal and ceramic magnetic characteristics appeared to be drastic. Magnetic moment relaxation rates were beyond the limit of about 3.10 −4 per hour.
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