Site-specific electronic and magnetic excitations of the skyrmion material Cu${}_2$OSeO${}_3$

Abstract

The manifestation of skyrmions in the Mott-insulator Cu${}_2$OSeO${}_3$ originates from a delicate balance between magnetic and electronic energy scales. As a result of these intertwined couplings, the two symmetry-inequivalent magnetic ions, Cu-I and Cu-II, bond into a spin S=1 entangled tetrahedron. However, conceptualizing the unconventional properties of this material and the energy of the competing interactions is a challenging task due the complexity of this system. Here we combine X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering to uncover the electronic and magnetic excitations of Cu${}_2$OSeO${}_3$ with site-specificity. We quantify the energies of the 3d crystal-field splitting for both Cu-I and Cu-II, fundamental to optimize model Hamiltonians. Additionally, we unveil a site-specific magnetic mode, indicating that individual spin character is preserved within the entangled-tetrahedron picture. Our results thus provide experimental constraint for validating theories that describe the interactions of Cu${}_2$OSeO${}_3$, highlighting the site-selective capabilities of resonant spectroscopies

References in corpus (28)

• Skyrmion Lattice in a Chiral Magnet
• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Resonant Inelastic X-ray Scattering Studies of Elementary Excitations
• Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu2OSeO3
• Energy and symmetry of $dd$ excitations in undoped layered cuprates measured by Cu $L_3$ resonant inelastic x-ray scattering
• Magnetoelectric coupling in the cubic ferrimagnet Cu2OSeO3
• Strong Dzyaloshinskii-Moriya Interaction and Origin of Ferroelectricity in Cu2OSeO3
• The quantum origins of skyrmions and half-skyrmions in Cu2OSeO3
• New magnetic phase of the chiral skyrmion material Cu2OSeO3
• Coupled skyrmion sublattices in Cu2OSeO3
• Magnetodielectric coupling of infrared phonons in single crystal Cu${}_2$OSeO${}_3$
• Resonant Elastic X-ray Scattering from the Skyrmion Lattice in Cu${}_2$OSeO${}_3$
• Magnetoelectric effects in the skyrmion host material Cu2OSeO3
• Magnon spectrum of the helimagnetic insulator Cu2OSeO3
• Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
• Magnetic nature of the 500 meV peak in $\mathrm{L}{\mathrm{a}}_{2-\mathrm{x}}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4$ observed with resonant inelastic x-ray scattering at the Cu $K$-edge
• EDRIXS: An open source toolkit for simulating spectra of resonant inelastic x-ray scattering
• Establishing the fundamental magnetic interactions in the chiral skyrmionic Mott insulator Cu2OSeO3 by terahertz electron spin resonance
• Orbital control of effective dimensionality: from spin-orbital fractionalization to confinement in the anisotropic ladder system CaCu2O3
• Room-temperature skyrmion phase in bulk Cu2OSeO3 under high pressures
• Electric field-driven topological phase switching and skyrmion lattice metastability in magnetoelectric Cu${}_2$OSeO${}_3$
• Optically probing symmetry breaking in the chiral magnet Cu2OSeO3
• Femtosecond dynamics of magnetic excitations from resonant inelastic x-ray scattering in CaCu2O3
• Entangled tetrahedron ground state and excitations of the magneto-electric skyrmion material Cu${}_2$OSeO${}_3$
• Magnonic Weyl states in Cu2OSeO3
• Spin excitations in the skymion host Cu2OSeO3
• Dual nature of magnetism in MnSi
• Inelastic light scattering in the spin cluster Mott insulator Cu${}_2$OSeO${}_3$

Cited by in corpus (3)

• Single- and Multimagnon Dynamics in Antiferromagnetic $\alpha$-Fe${}_2$O${}_3$ Thin Films
• Resonating holes vs molecular spin-orbit coupled states in group-5 lacunar spinels
• Observing Differential Spin Currents by Resonant Inelastic X-ray Scattering