Complete phase diagram of Sr${}_{1-x}$La${}_x$FeO${}_3$ with versatile magnetic and charge ordering

Abstract

A detailed electronic phase diagram of perovskite-type oxides Sr${}_{1-x}$La${}_x$FeO${}_3$ $(0\le x\le 0.5)$ was established by synchrotron X-ray diffraction, magnetization, and transport measurements for polycrystalline samples synthesized by a high-pressure technique. Among three kinds of helimagnetic phases in SrFeO${}_3$ at zero field, two of them showing multiple-$q$ helimagnetic spin textures tend to rapidly disappear in cubic symmetry upon the La substitution with $x$ less than 0.1, which accompanies the loss of metallic nature. On the other hand, the third helimagnetic phase apparently remains robustly in Sr${}_{1-x}$La${}_x$FeO${}_3$ with $x$ higher than 0.1, followed by merging to the spin/charge ordered phase with $x\sim 1/3$. We propose an important role of itinerant ligand holes on the emergence of multiple-$q$ states and a possible link between the third (putative single-$q$) helimagnetic phase in SrFeO${}_3$ and the spin/charge ordered phase in Sr${}_{2/3}$La${}_{1/3}$FeO${}_3$.

11 pages, 6 figures. Accepted for publication in Physical Review Materials

References in corpus (2)

• Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr${}_3$Fe${}_2$O${}_7$
• Double-$Q$ Chiral Stripe in the $d$-$p$ Model with Strong Spin-Charge Coupling

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