Vortices, skyrmions, and chirality waves in frustrated Mott insulators with a quenched periodic array of impurities

Abstract

Finite-$\mathbf{Q}$ magnetic instabilities are rather common in frustrated magnets. When the magnetic susceptibility is maximized at multiple-$\mathbf{Q}$ vectors related through lattice symmetry operations, exotic magnetic orderings such as vortex and skyrmion crystals may follow. Here we show that a periodic array of nonmagnetic impurities, which can be realized through charge density wave ordering, leads to a rich phase diagram featuring a plethora of chiral magnetic phases, especially when there is a simple relation between the reciprocal vectors of the impurity superlattice and the magnetic $\mathbf{Q}$-vectors. We also investigate the effect of changing the impurity concentration or disturbing the impurity array with small quenched randomness. Alternative realizations of impurity superlattices are briefly discussed.

18 pages, 16 figures, 2 tables

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Cited by in corpus (11)

• Skyrmions in Magnetic Multilayers
• Noncoplanar multiple-$Q$ spin textures by itinerant frustration: Effects of single-ion anisotropy and bond-dependent anisotropy
• Multiple skyrmion crystal phases by itinerant frustration in centrosymmetric tetragonal magnets
• Hedgehog-lattice spin texture in classical Heisenberg antiferromagnets on the breathing pyrochlore lattice
• Skyrmion crystals in centrosymmetric triangular magnets under hexagonal and trigonal single-ion anisotropy
• Dynamical Switching of Magnetic Topology in Microwave-Driven Itinerant Magnet
• Charge density waves in multiple-$Q$ spin states
• Skyrmion Crystal and Phase Transition in Magneto-Ferroelectric Superlattices: Dzyaloshinskii-Moriya Interaction in a Frustrated $J_1-J_2$ Model
• Emergent skyrmion-based chiral order in zero-field Heisenberg antiferromagnets on the breathing kagome lattice
• Magnetic Vortex induced by Nonmagnetic Impurity in Ferromagnets: Magnetic Multipole and Toroidal around the Vacancy
• Meron-antimeron crystals in noncentrosymmetric itinerant magnets on a triangular lattice