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

Jian-Rui Soh; Enrico Schierle; Da-Yu Yan; Hao Su; Dharmalingam Prabhakaran; Eugen Weschke; Yan-Feng Guo; You-Guo Shi; Andrew Boothroyd

doi:10.1103/PhysRevB.102.014408

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

Strongly Correlated Electrons 2020-07-15 v1

Authors: Jian-Rui Soh , Enrico Schierle , Da-Yu Yan , Hao Su , Dharmalingam Prabhakaran , Eugen Weschke , Yan-Feng Guo , You-Guo Shi , Andrew Boothroyd

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Abstract

We have investigated the magnetic correlations in the candidate Weyl semimetals EuCd $_2Pn_2$ , ( $Pn$ =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 N\'{e}el 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.

Keywords

topological semimetal Weyl semimetal resonant X-ray scattering diffuse magnetic scattering ferromagnetic correlations EuCd2As2 EuCd2Sb2

Cite

@article{arxiv.2005.04952,
  title  = {Resonant X-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd$_2$As$_2$ and EuCd$_2$Sb$_2$},
  author = {Jian-Rui Soh and Enrico Schierle and Da-Yu Yan and Hao Su and Dharmalingam Prabhakaran and Eugen Weschke and Yan-Feng Guo and You-Guo Shi and Andrew Boothroyd},
  journal= {arXiv preprint arXiv:2005.04952},
  year   = {2020}
}

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

Abstract

Keywords

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