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- W1566266407 abstract "We synthesized a series of GdFe$_{1-x}$Co$_x$AsO polycrystalline samples ($0 leq x leq 1$) by using a solid state reaction method and present a systematic study on the physical properties by means of electrical resistivity $rho(T)$, magnetic susceptibility $chi(T)$ and specific heat $C(T)$. The parent compound GdFeAsO undergoes a spin-density-wave (SDW) transition associated with Fe 3d-electrons around 130 K, followed by an antiferromagnetic (AFM) transition of Gd at $T^textup{Gd}_textup{N} approx$ 4 K. The SDW transition is quickly suppressed by Fe/Co substitution and superconductivity appears in a narrow doping range of $0.05 < x < 0.25$, showing a maximum $T_textup{sc}$ $approx$ 20 K around $x = 0.1$. On the other hand, the 4f-electrons of Gd are antiferromagnetically ordered over the entire doping concentration ($0 leq x leq 1$), while the Co 3d-electrons exhibit a ferromagnetic (FM) transition above $x approx 0.8$, with the Curie temperature ($T^textup{Co}_textup{C}$) reaching 75 K in GdCoAsO. These two magnetic species (Gd and Co) are coupled antiferromagnetically to give rise to ferrimagnetic behavior in magnetic susceptibility on the Co-rich side. For $0.7 leq x < 1.0$, the system undergoes a possible magnetic reorientation below $T^textup{Gd}_textup{N}$." @default.
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- W1566266407 date "2012-12-02" @default.
- W1566266407 modified "2023-09-26" @default.
- W1566266407 title "Moderate interaction between 3d- and 4f-electrons and ferrimagnetism in Co-doped GdFeAsO" @default.
- W1566266407 hasPublicationYear "2012" @default.
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