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Doping Dependence of Collective Spin and Orbital Excitations in the Spin-1 Quantum Antiferromagnet La 2 - x Sr x NiO 4 Observed by X Rays
Here, we report the first empirical demonstration that resonant inelastic x-ray scattering (RIXS) is sensitive to collective magnetic excitations in S=1 systems by probing the Ni L 3 edge of La 2$-$x Sr x NiO 4 (x=0, 0.33, 0.45). The magnetic excitation peak is asymmetric, indicating the presence of single and multi-spin-flip excitations. As the hole doping level is increased, the zone boundary magnon energy is suppressed at a much larger rate than that in hole doped cuprates. Based on the analysis of the orbital and charge excitations observed by RIXS, we argue that this difference is related to the orbital character of the doped holes in these two families. Lastly, this work establishes RIXS as a probe of fundamental magnetic interactions in nickelates opening the way towards studies of heterostructures and ultrafast pump-probe experiments.
Coexistence of Ferromagnetic and Stripe-Type Antiferromagnetic Spin Fluctuations in YFe 2 Ge 2
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Magnon Landau Levels and Spin Responses in Antiferromagnets
We study gauge fields produced by gradients of the Dzyaloshinskii-Moriya interaction and propose a model of an AFM topological insulator of magnons. In the long wavelength limit, the Landau levels induced by the inhomogeneous Dzyaloshinskii-Moriya interaction exhibit relativistic physics described by the Klein-Gordon equation. The spin Nernst response due to the formation of magnonic Landau levels is compared to similar topological responses in skyrmion and vortex-antivortex crystal phases of AFM insulators. Here, our studies show that AFM insulators exhibit rich physics associated with topological magnon excitations.
Strain-induced competition between ferromagnetism and emergent antiferromagnetism in (Eu,Sr) MnO 3
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Strong anisotropy in the mixed antiferromagnetic system Mn 1 − x Fe x PSe 3
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Strongly two-dimensional exchange interactions in the in-plane metallic antiferromagnet Fe[subscript 2]As probed by inelastic neutron scattering
Abstract not provided
Exotic surface magnetotransport phenomena in the antiferromagnetic Mott insulator Ni S 2
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Anisotropic anomalous transport in the kagome-based topological antiferromagnetic Mn 3 Ga epitaxial thin films
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Structural and physical properties of the chiral antiferromagnet CeRhC 2
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Collective spin dynamics of Z 2 vortex crystals in triangular Kitaev-Heisenberg antiferromagnets
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Intrinsic spin Nernst effect of magnons in a noncollinear antiferromagnet
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