Resonant X-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd${}_2$As${}_2$ and EuCd${}_2$Sb${}_2$

Abstract

We have investigated the magnetic correlations in the candidate Weyl semimetals EuCd${}_{2}P{n}_2$, ($Pn$=As, Sb) by resonant elastic X-ray scattering (REXS) at the Eu${}^{2+}$ $M_5$ edge. The temperature and field dependence of the diffuse scattering of EuCd${}_2$As${}_2$ provide direct evidence that the Eu moments exhibit slow ferromagnetic correlations well above the Néel temperature. By contrast, the diffuse scattering in the paramagnetic phase of isostructural EuCd${}_2$Sb${}_2$ is at least an order of magnitude weaker. The FM correlations present in the paramagnetic phase of EuCd${}_2$As${}_2$ could create short-lived Weyl nodes.

References in corpus (8)

• Topological Semimetals
• Discovery of Weyl fermion semimetals and topological Fermi arc states
• Topological Weyl semimetals in the chiral antiferromagnetic materials Mn3Ge and Mn3Sn
• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions
• Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd${}_2$As${}_2$
• A Single Pair of Weyl Fermions in Half-metallic EuCd2As2 Semimetal
• Effect of Eu magnetism on the electronic properties of the candidate Dirac material EuMnBi2
• The study of magnetic topological semimetals by first principles calculations

Cited by in corpus (4)

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• Anisotropy of the magnetic and transport properties in EuZn${}_2$As${}_2$
• Superexchange Interaction in Insulating EuZn${}_2$P${}_2$
• Long-Time Magnetic Relaxation in Antiferromagnetic Topological Material EuCd${}_2$As${}_2$