EPR studies are carried out on the polycrystalline high‐Tc superconductors MBa2Cu3O7 – δ (M = La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Tm, Yb and Lu). The onset of the superconducting transition is found to occur in the temperature range of 90 to 95 K (except for LaBa2Cu3O7 – δ where Tc = 50 K and PrBa2Cu3O7 – δ which is not superconducting for temperatures above 4.2 K). In all of these compounds an EPR spectrum of Cu2+ ions in the orthorhombic local symmetry, is observed. The signal intensities are found to depend strongly on the particular rare‐earth ions of the lanthanide series which are substitutionally introduced into the host lattice of YBa2Cu3O7 – δ at Y‐ions site. “Skin effect” is suggested to be the main cause of the observed changes in the intensity of EPR signals.
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