Rich magnetic phase diagram of putative helimagnet Sr 3 Fe 2 O 7

作者：N. D. Andriushin, Justus Grumbach, Jung-Hwa Kim, M. Reehuis, Y. V. Tymoshenko, Y. A. Onykiienko, A. Jain, W. A. MacFarlane, A. Maljuk, Sergey Granovsky, A. Hoser, Vladimir Pomjakushin, Jacques Ollivier, M. Doerr, B. Keimer, D. S. Inosov, Darren C. Peets · 发表于：Physical review. B./Physical review. B · 年份：2023 · DOI：10.1103/physrevb.108.174420 · 被引用次数：5 · 研究领域：Multiferroics and related materials、Advanced Condensed Matter Physics、Magnetic properties of thin films

The cubic perovskite ${\text{SrFeO}}_{\text{3}}$ was recently reported to host hedgehog- and skyrmion-lattice phases in a highly symmetric crystal structure which does not support the Dzyaloshinskii-Moriya interactions commonly invoked to explain such magnetic order. Hints of a complex magnetic phase diagram have also recently been found in powder samples of the single-layer Ruddlesden-Popper analog ${\text{Sr}}_{\text{2}}{\text{FeO}}_{\text{4}}$, so a reinvestigation of the bilayer material ${\text{Sr}}_{\text{3}}{\text{Fe}}_{\text{2}}{\text{O}}_{\text{7}}$, believed to be a simple helimagnet, is called for. Our magnetization and dilatometry studies reveal a rich magnetic phase diagram with at least six distinct magnetically ordered phases and strong similarities to that of ${\text{SrFeO}}_{\text{3}}$. In particular, at least one phase is apparently multiple-$\mathbf{q}$, and the $\mathbf{q}\mathrm{s}$ are not observed to vary among the phases. Since ${\text{Sr}}_{\text{3}}{\text{Fe}}_{\text{2}}{\text{O}}_{\text{7}}$ has only two possible orientations for its propagation vector, some of the phases are likely exotic multiple-$\mathbf{q}$ order, and it is possible to fully detwin all phases and more readily access their exotic physics.