Spin-density correlations in the dynamic spin-fluctuation theory: Comparison with polarized neutron scattering experiments

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• 作者：N.B. Melnikov^a ; ^{melnikov@cs.msu.su" class="auth_mail" title="E-mail the corresponding author} ; B.I. Reser^b ; ^{reser@imp.uran.ru" class="auth_mail" title="E-mail the corresponding author} ; G.V. Paradezhenko^a ; ^{gparadezhenko@cs.msu.su" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ferromagnetic metals ; Paramagnetic state ; Spin-density correlations ; Short-range order ; Polarized neutron scattering
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2016
• 出版时间：1 August 2016
• 年：2016
• 卷：411
• 期：Complete
• 页码：133-139
• 全文大小：897 K

文摘

To study the spin-density correlations in the ferromagnetic metals above the Curie temperature, we relate the spin correlator and neutron scattering cross-section. In the dynamic spin-fluctuation theory, we obtain explicit expressions for the effective and local magnetic moments and spatial spin-density correlator. Our theoretical results are demonstrated by the example of bcc Fe. The effective and local moments are found in good agreement with results of polarized neutron scattering experiment over a wide temperature range. The calculated short-range order is small (up to 4 Å) and slowly decreases with temperature.