Electron Spin Resonance in Cupric Oxide

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Paramagnetic and antiferromagnetic resonances of powdered CuO are investigated. Very broad paramagnetic resonance with the g-value of about 2.0 is observed above TN at the 45 GHz region under pulsed magnetic field. The linewidth is more than one Tesla and it is explained by the broadening due to the anisotropic exchange interaction between Cu2+ spins. One-dimensional spin correlation is seen in the line profile. The zero field antiferromagnetic resonance is found by means of the infrared absorption experiments in the temperature range between 5 K and 500 K. Two peaks at 350 and 510 cm−1 with the width of about 100 cm−1 are found. The result suggests that CuO might have a multisublattice structure even at low temperatures.

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