Plokhikh, Igor V. V. and Tsirlin, Alexander A. A. and Khalyavin, Dmitry D. D. and Fischer, Henry E. E. and Shevelkov, Andrei V. V. and Pfitzner, Arno (2023) Effect of antifluorite layer on the magnetic order in Eu-based 1111 compounds, EuTAsF (T = Zn, Mn, and Fe). PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 25 (6). pp. 4862-4871. ISSN 1463-9076, 1463-9084
Full text not available from this repository. (Request a copy)Abstract
The 1111 compounds with an alternating sequence of fluorite and antifluorite layers serve as structural hosts for the vast family of Fe-based superconductors. Here, we use neutron powder diffraction and density-functional-theory (DFT) band-structure calculations to study magnetic order of Eu2+ in the [EuF](+) fluorite layers depending on the nature of the [TAs](-) antifluorite layer that can be non-magnetic semiconducting (T = Zn), magnetic semiconducting (T = Mn), or magnetic metallic (T = Fe). Antiferromagnetic transitions at T-N similar to 2.4-3 K due to an ordering of the Eu2+ magnetic moments were confirmed in all three EuTAsF compounds. Whereas in EuTAsF (T = Zn and Mn), the commensurate k(1) = (1/2 1/2 0) stripe order pattern with magnetic moments within the a-b plane is observed, the order in EuFeAsF is incommensurate with k = (0 0.961(1) 1/2) and represents a cycloid of Eu2+ magnetic moments confined within the bc-plane. Additionally, the Mn2+ sublattice in EuMnAsF features a robust G-type antiferromagnetic order that persists at least up to room temperature, with magnetic moments along the c-direction. Although DFT calculations suggest stripe antiferromagnetic order in the Fe-sublattice of EuFeAsF as the ground state, neutron diffraction reveals no evidence of long-range magnetic order associated with Fe. We show that the frustrating interplane interaction J(3) between the adjacent [EuF](+) layers is comparable with in-plane J(1)-J(2) interactions already in the case of semiconducting fluorite layers [TAs](-) (T = Zn and Mn) and becomes dominant in the case of the metallic [FeAs](-) ones. The latter, along with a slight orthorhombic distortion, is proposed to be the origin of the incommensurate magnetic structure observed in EuFeAsF.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHYSICAL-PROPERTIES; SUPERCONDUCTORS; SCATTERING; PN; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Arno Pfitzner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Mar 2024 11:58 |
| Last Modified: | 23 Mar 2024 11:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60441 |
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