On the Spin Broadening of Mössbauer Lines of Impurities in Ferromagnetics and of Atoms in Antiferromagnetics

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Abstract
The broadening and shift of Mössbauer lines for the nuclei of impurity atoms in ferromagnetics due to the interaction between the nucleus and atomic spins are discussed. Detailed examination is made of the effects associated with quasi‐local and local spin excitations. It is shown that low‐frequency quasi‐local excitations can lead to a value of broadening some orders greater as compared with the case of ideal ferromagnetics. The broadening of Mössbauer lines is also determined for the ideal antiferromagnetic.