Rich Magnetic Phase Diagram of Putative Helimagnet Sr${}_3$Fe${}_2$O${}_7$

Abstract

The cubic perovskite SrFeO${}_3$ 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 Sr${}_2$FeO${}_4$, so a reinvestigation of the bilayer material Sr${}_3$Fe${}_2$O${}_7$, believed to be a simple helimagnet, is called for. Our magnetization and dilatometry studies reveal a rich magnetic phase diagram with at least 6 distinct magnetically ordered phases and strong similarities to that of SrFeO${}_3$. In particular, at least one phase is apparently multiple-$\mathbf{q}$, and the $\mathbf{q}$s are not observed to vary among the phases. Since Sr${}_3$Fe${}_2$O${}_7$ 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.

14 pages, 13 figures

References in corpus (10)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Spontaneous Skyrmion Ground States in Magnetic Metals
• Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu2OSeO3
• Meron, skyrmion, and vortex crystals in centrosymmetric tetragonal magnets
• The Double-$Q$ Ground State with Topological Charge Stripes in the Skyrmion Candidate ${\text{GdRu}}_{\text{2}}{\text{Si}}_{\text{2}}$
• Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr${}_3$Fe${}_2$O${}_7$
• Multifarious skyrmion phases on a trilayer triangular lattice
• Putative helimagnetic phase in the kagome metal Co_3Sn_2-xIn_xS_2
• Hidden Charge Order in an Iron Oxide Square-Lattice Compound
• Anisotropic spin model and multiple-$Q$ states in cubic systems

Cited by in corpus (4)

• Reentrant multiple-$\mathbf{q}$ magnetic order and a "spin-cholesteric" phase in Sr${}_3$Fe${}_2$O${}_7$
• Magnetic Phase Diagram of Rouaite, Cu${}_2$(OH)${}_3$NO${}_3$
• Exploration of metastable A-site-ordered perovskites (Ca,Ba)FeO3-δ by computationally-guided multi-step synthesis
• Anomalous quasielastic scattering contribution in the centrosymmetric multi-$\mathbf{q}$ helimagnet SrFeO${}_3$