Magnetic short-range order in Fe and Ni above the Curie temperatureстатья
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Дата последнего поиска статьи во внешних источниках: 24 декабря 2018 г.
Аннотация:We study magnetic short-range order in Fe and Ni above the Curie temperature using the nonlocal dynamic spin-fluctuation theory with self-consistent calculation of the self-energy. We calculate the spatial correlation function of Fe and Ni at nearest neighbours, next-nearest neighbours, etc., in a wide range of temperatures. Our results are in agreement with neutron scattering experiments but give a larger short-range order compared to classical spin models. We show that the spatial spin correlator decreases ten times at distances of about 6 Å in Fe and 8 Å in Ni at T/T_C=1.1 and short-range order remains well above the Curie point.