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It is shown that electron paramagnetic resonance (EPR) can be used to observe the spin gap in copper oxide superconductors. The electron paramagnetic resonance spectra of the Cu 2+  ion in underdoped  show a pronounced decrease in intensity in the normal state as the temperature is lowered to 133 K, the superconducting  transition temperature of the material. The decrease is attributed to a pairing of the Cu 2+    spins to form a spin gap. A spin gap of 0.0533 eV is estimated from the data which is in order of magnitude agreement with values obtained from NMR measurements.

Paramagnetic Resonance as a Probe of the Spin Gap in Normal State of Superconductor