Effect of high pressure and chemical substitution on the crystal structure and magnetic state of R2Fe17 ? x Six (R = Lu or Y; x = 0 or 1.7) |
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Authors: | D P Kozlenko V I Voronin V P Glazkov and B N Savenko |
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Institution: | (1) Joint Institute for Nuclear Research, Dubna, Moscow region, 141980, Russia;(2) Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevsko’ 18, Yekaterinburg, 620219, Russia;(3) Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia |
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Abstract: | The effect of high pressure on the crystal structure of the intermetallic compounds R2Fe17 − x
Six (R = Lu or Y; x = 0 or 1.7) was studied using neutron diffraction. A correlation between changes in structural parameters and magnetic properties
under the action of high pressure, as well as under chemical substitution of Si for Fe atoms, was analyzed in terms of localized
moment and spin fluctuation models. The spin fluctuation model was found to describe more adequately the experimentally observed
increase in the Curie temperature upon chemical substitution and the decrease in this temperature under the action of high
pressure. Possible reasons for the suppression of a collinear ferromagnetic state and the occurrence of a noncollinear antiferromagnetic
state in R2Fe17−x
Six under pressure are discussed based on estimated differences between the total energy minima of these states.
Original Russian Text ? D.P. Kozlenko, V.I. Voronin, V.P. Glazkov, B.N. Savenko, 2007, published in Pis’ma v Zhurnal éksperimental’noĭ
i Teoreticheskoĭ Fiziki, 2007, Vol. 86, No. 9, pp. 675–680. |
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