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.

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• Anisotropy of the magnetic and transport properties in EuZn${}_2$As${}_2$
• EuCd${}_2$As${}_2$: a magnetic semiconductor
• Consecutive topological phase transitions and colossal magnetoresistance in a magnetic topological semimetal
• Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd${}_2$P${}_2$
• The discovery of three-dimensional Van Hove singularity
• Optical properties and carrier localization in the layered phosphide EuCd${}_2$P${}_2$
• Superexchange Interaction in Insulating EuZn${}_2$P${}_2$
• Long-Time Magnetic Relaxation in Antiferromagnetic Topological Material EuCd${}_2$As${}_2$
• Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd2As2
• Revealing the EuCd_{2}As_{2} Semiconducting Band Gap via n-type La-Doping
• Recent advances in understanding and manipulating magnetic and electronic properties of Eu$M_2{X}_2$ ($M$ = Zn, Cd; $X$ = P, As)
• Observation of paramagnetic spin-degeneracy lifting in EuZn2Sb2