Resonant x-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd2As2 and EuCd2Sb2
| Autor: | Hao Su, D. Prabhakaran, Yanfeng Guo, Eugen Weschke, Y. G. Shi, J.-R. Soh, Enrico Schierle, Donghang Yan, Andrew T. Boothroyd |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed matter physics Scattering X-ray 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Semimetal Paramagnetism Diffuse scattering Ferromagnetism 0103 physical sciences Condensed Matter::Strongly Correlated Electrons Isostructural 010306 general physics 0210 nano-technology Order of magnitude |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We have investigated the magnetic correlations in the candidate Weyl semimetals ${\mathrm{EuCd}}_{2}P{n}_{2}$ ($Pn=\mathrm{As}$, Sb) by resonant elastic x-ray scattering at the ${\mathrm{Eu}}^{2+}$ ${M}_{5}$ edge. The temperature and field dependence of the diffuse scattering of ${\mathrm{EuCd}}_{2}{\mathrm{As}}_{2}$ provide direct evidence that the Eu moments exhibit slow ferromagnetic (FM) correlations well above the N\'eel temperature. By contrast, the diffuse scattering in the paramagnetic phase of isostructural ${\mathrm{EuCd}}_{2}{\mathrm{Sb}}_{2}$ is at least an order of magnitude weaker. The FM correlations present in the paramagnetic phase of ${\mathrm{EuCd}}_{2}{\mathrm{As}}_{2}$ could create short-lived Weyl nodes. |
| Databáze: | OpenAIRE |
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