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We report an investigation of magnetic resonance by ESR in oxygen-doped La2NiO $$_{4 + \delta }$$ emphasizing extensively for the first time the role of oxygen stoichiometry. The work is performed at room temperature and on powders with $$0.015 \le \delta \le 0.17$$ . At low field an hysteresis is detected between increasing and decreasing fields, it depends upon $$\delta $$ . The resonance...
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