TY - JOUR A1 - Qureshi, Navid A1 - Morrow, Ryan A1 - Eltoukhy, Samar A1 - Grinenko, Vadim A1 - de Oliveira Guilherme Buzanich, Ana A1 - Onykiienko, Yevhen A. A1 - Kulbakov, Anton A1 - Inosov, Dmytro S. A1 - Adler, Peter A1 - Valldor, Martin T1 - Noncollinear Magnetic Structures in the Chiral Antiperovskite β-Fe2SeO N2 - We present the magnetic properties of the chiral, polar, andpossibly magnetoelectric antiperovskite β-Fe2SeO as derived from magnet-ization and specific-heat measurements as well as from powder neutrondiffraction and Mössbauer experiments. Our macroscopic data unambig-uously reveal two magnetic phase transitions at TN1 ≈ 103 K and TN2 ≈ 78K, while Rietveld analysis of neutron powder diffraction data reveals anoncollinear antiferromagnetic structure featuring magnetic moments inthe a−b plane of the trigonal structure and a ferromagnetic moment alongc. The latter is allowed by symmetry between TN1 and TN2, weakly visible inthe magnetization data yet unresolvable microscopically. While theintermediate phase can be expressed in the trigonal magnetic spacegroup P31, the magnetic ground state is modulated by a propagation vectorq = (1/2 1/2 0) resulting in triclinic symmetry and an even more complexlow-temperature spin arrangement which is also reflected in the Mö ssbauer hyperfine patterns indicating additional splitting of Fesites below TN2. The complex noncollinear spin arrangements suggest interesting magnetoelectric properties of this polar magnet. KW - EXAFS KW - Antiperovskite KW - Magnetic structure PY - 2024 DO - https://doi.org/10.1021/acs.inorgchem.4c02916 SN - 0020-1669 VL - 63 IS - 48 SP - 22712 EP - 22720 PB - American Chemical Society (ACS) AN - OPUS4-63116 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -