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- W2156746432 abstract "The magnetic phase transition in iron-nickel fcc alloys ${mathrm{Fe}}_{70}{mathrm{Ni}}_{30}$ doped by carbon (0.7% at.) is investigated using the three-dimensional analysis of the neutron depolarization (ND) and small-angle neutron scattering (SANS). The coexistence and the growth of two different scale magnetic correlations are observed in a paramagnetic phase as temperature closes to ${T}_{C}.$ The usual critical fluctuations of a Lorentzian shape with size ${R}_{c}<200 mathrm{AA{}}$ are found by the analysis of SANS intensity $I(q).$ The ND analysis shows also presence of the large scale correlations (about ${10}^{3}ensuremath{-}{10}^{4} mathrm{AA{}})$ with the ``squared'' Lorentzian shape. We attribute these large scale correlations to local variations of the Curie temperature ${T}_{C}.$ The local ${T}_{C}$ variations are described by the disorder parameters of the system: $〈{T}_{C}〉,$ a spread of ${T}_{C}$ variations $ensuremath{Delta}{T}_{C},$ and characteristic size of the local areas ${R}_{0},$ where ${T}_{C}$ variations occur. The ratio between the depth of the ${T}_{C}$ variations $(ensuremath{Delta}{T}_{C}/〈{T}_{C}〉)$ and its characteristic correlation length ${R}_{0}/a (a$ is a lattice constant) determines a scenario of the transition: ``percolative'' or ``homogeneous'' ones. At ${R}_{0}/aensuremath{gg}(ensuremath{Delta}{T}_{C}/〈{T}_{C}〉{)}^{ensuremath{-}2/3}$ locally ordered ferromagnetic regions appear in paramagnetic phase and form a large percolative cluster. In this case the connectivity length of the ordered regions dominates at the correlation length of thermal fluctuations. Therefore this transition goes in accordance with the ``percolative'' scenario. All three parameters of the transition are obtained from the data of the three dimension analysis of the ND. From the temperature dependence of the magnetization, we found $〈{T}_{C}〉=397ifmmodepmelsetextpmfi{}0.5 mathrm{K}$ and $ensuremath{Delta}{T}_{C}=4.55ifmmodepmelsetextpmfi{}0.05 mathrm{K}.$ From ND data we estimated the temperature independent characteristic size ${R}_{0}$ of the ${T}_{C}$ variations. It is equal to ${10}^{4} mathrm{AA{}}.$" @default.
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- W2156746432 date "2001-08-14" @default.
- W2156746432 modified "2023-09-25" @default.
- W2156746432 title "Magnetic phase transition in disordered Fe-Ni alloys studied by means of small-angle neutron scattering and three-dimensional analysis of the neutron depolarization" @default.
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- W2156746432 doi "https://doi.org/10.1103/physrevb.64.094426" @default.
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