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| Home > Publications database > Redetermination of the incommensurately modulated magnetic structure of CrAs |
| Conference Presentation (Invited) | FZJ-2023-01571 |
2023
Abstract: Chromium arsenide (CrAs) is considered a model system in which superconductivity and helimagnetism coexist. Thesuperconductivity is induced by pressure and forms a dome-like phase region with a maximum TC of 2.2 K at about 1 GPa. Thesuperconductivity occurs in the vicinity of an antiferromagnetical phase of CrAs which is incommensurate and described as adouble helix in the literature. This model was first proposed on the basis of neutron powder diffraction data and assuming ananalogous magnetic structure as the one observed for MnP [1]. Since the model was in reasonable agreement with the powderPage 18Monday, 20 March 2023diffraction data, it was henceforth considered to be correct for CrAs. We have investigated the magnetic structure of CrAs for thefirst time by means of neutron high-pressure single-crystal diffraction in clamp cells. The results clearly show that the establishedmodel of the magnetic structure of CrAs is not in accordance with the measured intensities and can be discarded. While our datado not allow an unambiguous identification of one singular model, we identify four candidate models based on a stringent use ofgroup theoretical considerations and the subsequent refinement using magnetic superspace groups with the program Jana2006[2]. Details of these models will be presented. Acknowledgments: This work was supported by the BMBF under projectNo.05K19PA2. [1] H. Watanabe et.al., J. Appl. Phys. 40,1128-1129 (1969). [2] V. Petricek et. al.,. Z. Kristallogr. 229, 345-352(2014).
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