Abstract
All iron ions in the Cu1 and Cu2 local lattice sites of the YBa2(Cu0.957Fe0.1)3O7.01 superconductor with Tc=31 K experienced magnetic ordering below Tm=22 K. Therefore, at T < Tm, magnetic ordering coexisted with superconductivity. According to the Mossbauer spectroscopy data, iron ions in Cu2 (Fe2) sites were in the low-spin state at T < Tm(S= 3/2 or 1/2), whereas an equal number of iron ions in Cu1 (Fe1) sites were in the high-spin Fe3+ state (S=5/2). The magnetic transition near Tm changed iron ion spin states-low-spin ions turned into high-spin ions, and vice versa. This preserved the spin balance between iron ions in the Cu1 and Cu2 layers. Control measurements on other samples of the YBa2(Cu1− xFex)3O7±δ series substantiated these conclusions.
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