We show that zero-field muon-spin-relaxation studies of the critical paramagnetic fluctuations in ferromagnets are mostly sensitive to fluctuation modes at small wave vectors. The transverse-fluctuation modes can be probed very close to the zone center when the temperature approaches the Curie temperature. A quantitative determination of the zone probed in Ni and Fe is performed.
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Réotier et al. (1994) studied this question.
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