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Nuclear magnetic resonance of ⁵⁵Mn nuclei, detected through its effect on the antiferromagnetic resonance, has been used to measure the zero-point spin reduction in the quadratic layer antiferromagnets K₂MnF₄ and Rb₂MnF₄. The result, including a small correction for supertransferred hyperfine effects, is S-〈Sz〉T=0=0.17±0.03, in excellent agreement with spin-wave theory.
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Walstedt et al. (1970) studied this question.
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