Abstract
The high-T c superconductors Bi 1.55 Pb 0.25 Sr 2 Ca 2.2 Cu 3 O 10, Bi 1.75 Pb 0.25 Sr 2 Ca 2 Cu 3 O 10 and Bi 1.75 Pb 0.25 Sr 2 Ca 3 Cu 4 O 12 (with about T c =106, 103 and 101 K, respectively) have been investigated using EPR method. Differences in intensities of the EPR spectra of Cu 2+ ions have been observed. These differences could be caused by the skin effect.
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