Use of the isotope 57Fe for neutron-diffraction determination of positions of iron atoms in the superconductor Y1Ba2(Cu1-xFex)3Oy
Balagurov A. M. , Lyubutin I. S., Mironova G. M., Huan Chan Gen, Shapiro A. Ya.
A neutron-diffraction structural analysis has been made of the system YIBa2(Cu1 _xFex )3)Oy (0.0<x<0.27), in which the iron was enriched to 95.7% in the isotope 57Fe. Up to x0 — 0.10, the iron atoms lie exclusively at Cu 1 sites. At a higher concentration χ = x0 + Ajc, the "excess" iron Δλ; is distributed equiprobably between Cu 1 and Cu2 sites. The introduction of iron results in the capture of additional oxygen, in an amount of 0.5 of an oxygen atom per iron cation.
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![](/ps/1131/article_17132_800_head.png "A neutron-diffraction structural analysis has been made of the system Y<sub>I</sub>Ba<sub>2</sub>(Cu<sub>1</sub> <i>_<sub>x</sub>Fe<sub>x</sub> )<sub>3)</sub>O<sub>y</sub> </i>(0.0<x<0.27), in which the iron was enriched to 95.7% in the isotope <sup>57</sup>Fe. Up to <b><i>x<sub>0</sub> — </i></b>0.10, the iron atoms lie exclusively at Cu 1 sites. At a higher concentration <b><i>χ = x<sub>0</sub> </i>+ Ajc</b>, the "excess" iron <b>Δλ</b>; is distributed equiprobably between Cu 1 and Cu2 sites. The introduction of iron results in the capture of additional oxygen, in an amount of 0.5 of an oxygen atom per iron cation.")