Skyrmion lattice with a giant topological Hall effect in a frustrated triangular-lattice magnet

Abstract

Geometrically frustrated magnets provide abundant opportunities for discovering complex spin textures, which sometimes yield unconventional electromagnetic responses in correlated electron systems. It is theoretically predicted that magnetic frustration may also promote a topologically nontrivial spin state, i.e., magnetic skyrmions, which are nanometric spin vortices. Empirically, however, skyrmions are essentially concomitant with noncentrosymmetric lattice structures or interfacial-symmetry-breaking heterostructures. Here, we report the emergence of a Bloch-type skyrmion state in the frustrated centrosymmetric triangular-lattice magnet Gd2PdSi3. We identified the field-induced skyrmion phase via a giant topological Hall response, which is further corroborated by the observation of in-plane spin modulation probed by resonant x-ray scattering. Our results exemplify a new gold mine of magnetic frustration for producing topological spin textures endowed with emergent electrodynamics in centrosymmetric magnets.

23 pages, 3 figures

References in corpus (8)

• Skyrmions in Magnetic Multilayers
• Effective bilinear-biquadratic model for noncoplanar ordering in itinerant magnets
• Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition
• A hidden constant in the anomalous Hall effect of a high-purity magnet MnSi
• Giant generic topological Hall resistivity of MnSi under pressure
• Chirality induced anomalous-Hall effect in helical spin crystals
• Electronic structure and nesting-driven enhancement of the RKKY interaction at the magnetic ordering propagation vector in Gd2PdSi3 and Tb2PdSi3
• Magnetic chirality as probed by neutron scattering

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• A $C^{\ast }$-algebraic view on the interaction of real- and reciprocal space topology in skyrmion crystals
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• Unconventional Hall effect and its variation with Co-doping in van der Waals Fe3GeTe2
• Finite-temperature stability of skyrmion crystals in frustrated magnets: Role of sixfold anisotropy and uniform spin mode in momentum space
• Double-$Q$ chiral stripe order in the anomalous Hall antiferromagnet CoNb${}_3$S${}_6$
• Effects of crystal field and momentum-based frustrated exchange interactions on multiorbital square skyrmion lattice
• Chiral electronic network within skyrmionic lattice on topological insulator surfaces
• ${\mathbb{Z}}_2$ Vortex Crystals in Tetrahedral Antiferromagnets: Fractional Charges and Topological Magnons