Possible Josephson oscillations spectra and electron paramagnetic resonance of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>in Y-Ba-Cu-O

A broad spectrum around 50 G, possibly due to Josephson oscillations, has been observed in the superconductor ${\mathrm{Y}}_{1}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7+x}$, using standard $X$- band EPR methodology. The spectrum has its tail extending to high fields and exhibiting complex oscillatory patterns such as expected from Josephson loops of sizes in the range of 0.65-0.81 \ensuremath{\mu}. The EPR method can directly and nonabrasively detect small superconducting domains and ${\mathrm{Cu}}^{2+}$ inclusions in these materials. The detection of numerous Josephson junctions naturally present in such materials open up the possibilities for building new types of superconducting quantum interference devices.

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