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Mar 20 – 23, 2023
Campus Garching
Europe/Berlin timezone

Redetermination of the incommensurately modulated magnetic structure of CrAs

Mar 20, 2023, 3:20 PM
MW 0 001 - Lecture hall (Fakultät für Maschinenwesen)

MW 0 001 - Lecture hall

Fakultät für Maschinenwesen

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Talk (17 + 3 min) Chemistry of Materials (Structure and Spectroscopy) Magnetic Structures


Karen Friese (Jülich Centre for Neutron Science, Research Centre Jülich)


Chromium arsenide (CrAs) is considered a model system in which superconductivity and helimagnetism coexist. The superconductivity is induced by pressure and forms a dome-like phase region with a maximum TC of 2.2 K at about 1 GPa. The superconductivity occurs in the vicinity of an antiferromagnetical phase of CrAs which is incommensurate and described as a double helix in the literature. This model was first proposed on the basis of neutron powder diffraction data and assuming an analogous magnetic structure as the one observed for MnP [1]. Since the model was in reasonable agreement with the powder diffraction data, it was henceforth considered to be correct for CrAs.
We have investigated the magnetic structure of CrAs for the first time by means of neutron high-pressure single-crystal diffraction in clamp cells. The results clearly show that the established model of the magnetic structure of CrAs is not in accordance with the measured intensities and can be discarded. While our data do not allow an unambiguous identification of one singular model, we identify four candidate models based on a stringent use of group 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 project No.05K19PA2.

[1] H. Watanabe et.al., J. Appl. Phys. 40,1128-1129 (1969).
[2] V. Petricek et. al.,. Z. Kristallogr. 229, 345-352 (2014).

Primary authors

Andreas Eich (Forschungszentrum Jülich GmbH) Karen Friese (Jülich Centre for Neutron Science, Research Centre Jülich) Thomas Wolf (Karlsruhe Institute for Technology, Institute for Quantum Materials & Technologies) Dr Yixi Su (JCNS-MLZ) Andrzej Grzechnik (Jülich Centre for Neutron Science-4)

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