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The hyperfine field, Hhf(T), in polycrystalline CuO has been studied by ⁵⁷Fe M\"ossbauer-source spectroscopy (MS), μ₊ spin rotation μSR, and ¹⁰⁰Rh perturbed angular correlation (PAC) over 4K<T<295K. Antiferromagnetic order is observed below TN=226(1) K. MS and PAC each exhibit a single dominant site with no K-capture aftereffects while μSR has five components. For μSR and PAC Hhf(T) is well approximated by spin S=1/2 mean-field theory; for MS it is anomalous, indicating a significant difference in spin between Fe and Cu and/or moment coupling for Fe-Cu and Cu-Cu. There is no evidence for long-range dynamic correlations, as observed for La₂CuO₄.
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Niedermayer et al. (1988) studied this question.
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