Magnetic properties of Gd$T_2$Zn${}_{20}$ (T = Fe, Co) investigated by X-ray diffraction and spectroscopy

Abstract

We investigate the magnetic and electronic properties of the Gd$T_2$Zn${}_{20}$ ($T$ = Fe and Co) compounds using X-ray resonant magnetic scattering (XRMS), X-ray absorption near-edge structure (XANES) and X-ray magnetic circular dichroism (XMCD) techniques. The XRMS measurements reveal that the GdCo${}_2$Zn${}_{20}$ compound has a commensurate antiferromagnetic spin structure with a magnetic propagation vector $\vec{\tau }$ = $(\frac{1}{2},\frac{1}{2},\frac{1}{2})$ below the Néel temperature ($T_N\sim$ 5.7 K). Only the Gd ions carry a magnetic moment forming an antiferromagnetic structure with magnetic representation ${\Gamma }_6$. For the ferromagnetic GdFe${}_2$Zn${}_{20}$ compound, an extensive investigation was performed at low temperature and under magnetic field using XANES and XMCD techniques. A strong XMCD signal of about 12.5 $\%$ and 9.7 $\%$ is observed below the Curie temperature ($T_C\sim$ 85 K) at the Gd-$L_2$ and $L_3$ edges, respectively. In addition, a small magnetic signal of about 0.06 $\%$ of the jump is recorded at the Zn $K$-edge suggesting that the Zn 4$p$ states are spin polarized by the Gd 5$d$ extended orbitals.

References in corpus (6)

• YSix closely related YbT${}_2$Zn${}_{20}$ (T = Fe, Co, Ru, Rh, Os, Ir) heavy fermion compounds with large local moment degeneracy
• Heavy electrons and the symplectic symmetry of spin
• Supplementary material to Heavy electrons and the symplectic symmetry of spin
• Variation of the magnetic ordering in GdT${}_2$Zn${}_{20}$ (T= Fe, Ru, Os, Co, Rh and Ir) and its correlation with the electronic structure of isostructural YT${}_2$Zn${}_{20}$
• Enhancement of Curie temperature due to the coupling between Fe itinerant electrons and Dy localized electrons in DyFe2Zn20
• Study of 57Fe Mossbauer effect in RFe2Zn20 ( R = Lu, Yb, Gd)

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