Magnetic and electronic structure of the layered rare-earth pnictide EuCd${}_2$Sb${}_2$

Abstract

Resonant elastic X-ray scattering (REXS) at the Eu $M_5$ edge reveals an antiferromagnetic structure in layered EuCd${}_2$Sb${}_2$ at temperatures below $T_{\text{N}}$ = 7.4 K with a magnetic propagation vector of $(0,0,1/2)$ and spins in the basal plane. Magneto-transport and REXS measurements with an in-plane magnetic field show that features in the magnetoresistance are correlated with changes in the magnetic structure induced by the field. Ab initio electronic structure calculations predict that the observed spin structure gives rise to a gapped Dirac point close to the Fermi level with a gap of $\Delta E\sim$0.01 eV. The results of this study indicate that the Eu spins are coupled to conduction electron states near the Dirac point.

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• Intrinsic Magnetic Topological Materials
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• Observation of in-plane anomalous Hall effect associated with orbital magnetization
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• Maximizing intrinsic anomalous Hall effect by controlling the Fermi level in simple Weyl semimetal films
• Field-tunable Weyl points and large anomalous Hall effects in degenerate magnetic semiconductor EuMg${}_2$Bi${}_2$
• Berry curvature derived negative magnetoconductivity observed in type-II magnetic Weyl semimetal films
• Resonant elastic X-ray scattering of antiferromagnetic superstructures in EuPtSi${}_3$
• Stark difference in the in-plane anomalous Hall response in Zintl compounds EuA2Sb2 (A = Zn, Cd) thin films
• Recent advances in understanding and manipulating magnetic and electronic properties of Eu$M_2{X}_2$ ($M$ = Zn, Cd; $X$ = P, As)
• Origin of the large topological Hall effect in the EuCd${}_2$Sb${}_2$ antiferromagnet
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