Abstract
The resistivity, electron paramagnetic resonance (EPR) and microstructure of polycrystallines Ru1−xPbxSr2Gd1.4Ce0.6Cu2O10−δ (x=0, 0.03, 0.2, 0.4, 0.5) have been studied systematically. Pb doping reduces the conductivity and suppresses the superconductivity, which may reflect the increase in hole localization due to disorder effects resulting from Pb doping. The temperature dependencies of magnetic resonance for samples Ru1−xPbxSr2Gd1.4Ce0.6Cu2O10−δ show that there are two absorption peaks. The first one around the magnetic field 3300 Oe corresponds to the electron paramagnetic resonance (EPR) of the Gd ions, and the second that appears below the ferromagnetic transition temperature is a ferromagnetic resonance (FMR) due to the ordered Ru ions.
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