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| Hauptseite > Publikationsdatenbank > The Crystal Structure Behaviour of CrAs at Low Temperatures and at High Pressures |
| Hauptseite > Publikationsdatenbank > The Crystal Structure Behaviour of CrAs at Low Temperatures and at High Pressures |
| Talk (non-conference) (Invited) | FZJ-2020-02799 |
2020
Abstract: Chromium Arsenide (CrAs) is the first reported Cr-based superconductor, exhibiting pressure-induced superconductivity above ~0.3 GPa with a maximum Tc ≈ 2.2 K at 1 GPa. The superconducting phase region with a dome-like shape lies in the vicinity of a helimagnetically ordered antiferromagnetic state, with a region of coexistence of magnetism and superconductivity below ~0.7 GPa. Short-range magnetic fluctuations are assumed to play an essential role for the pairing mechanism of the superconductivity, and CrAs is considered to be a model system for the interplay of superconductivity and helimagnetism.Up to now, most studies on CrAs in and near the superconducting phase region were focused on magnetic and resistive properties. The crystal structure of CrAs, however, has not been conclusively investigated yet, especially in dependence on the temperature, with only a few isolated data points existing for the full structure. The aim of our investigation is thus to give an overview of the complete structural behaviour of CrAs in dependence of temperature and pressure to serve as reference for later studies in the two-parameter field.Our results based on synchrotron X-ray single-crystal diffraction reveal previously unknown features of CrAs related to the first-order phase transition from the paramagnetic to the antiferromagnetic state at TN ≈ 267 K. A significant change in the microstructure might have practical implications for the occurrence of the superconductivity, while the discovery of one distinguished interatomic distance in the structure might further elucidate the nature of the superconductivity on a fundamental level.
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