Abstract

We have studied by electron spin resonance (ESR) the nonsuperconducting system Ru-1212 and the superconducting and nonsuperconducting Ru-2212 over the temperature range 100–300 K, in the normal and magnetic phases. In the nonsuperconducting Ru-1212 we found that the ferromagnetic line appears at a much higher temperature than the magnetic ordering as determined by neutron diffraction. We also show a correlation between the temperature dependence of the intensity and width of the ESR resonance lines, the intensity of magnetic absorption lines and the DC magnetization measurements.

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