Skyrmion phase and competing magnetic orders on a breathing kagome lattice

Abstract

Magnetic skyrmion textures are realized mainly in non-centrosymmetric, e.g. chiral or polar, magnets. Extending the field to centrosymmetric bulk materials is a rewarding challenge, where the released helicity / vorticity degree of freedom and higher skyrmion density result in intriguing new properties and enhanced functionality. We report here on the experimental observation of a skyrmion lattice (SkL) phase with large topological Hall effect and an incommensurate helical pitch as small as 2.8 nm in metallic Gd3Ru4Al12, which materializes a breathing kagomé lattice of Gadolinium moments. The magnetic structure of several ordered phases, including the SkL, is determined by resonant x-ray diffraction as well as small angle neutron scattering. The SkL and helical phases are also observed directly using Lorentz transmission electron microscopy. Among several competing phases, the SkL is promoted over a low-temperature transverse conical state by thermal fluctuations in an intermediate range of magnetic fields.

35 pages, 4 figures

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Cited by in corpus (195)

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• Complex magnetic phases enriched by charge density waves in topological semimetals GdSb_xTe_{2-x-δ}
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• Mechanism of antisymmetric spin polarization in centrosymmetric multiple-$Q$ magnets based on bilinear and biquadratic spin cross products
• Magnon-Skyrmion Hybrid Quantum Systems: Tailoring Interactions via Magnons
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• Dynamical Switching of Magnetic Topology in Microwave-Driven Itinerant Magnet
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