Magnon interactions in the quantum paramagnetic phase of 
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Gallegos, C. A.; Chernyshev, A. L.

doi:10.1103/physrevb.109.014424

Phys. Rev. B

2024

DOI: 10.1103/physrevb.109.014424

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Magnon interactions in the quantum paramagnetic phase of CoNb2O6

C. A. Gallegos,

A. L. Chernyshev

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2024

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Cited by 3 publications

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Cobalt-based pyroxenes: A new playground for Kitaev physics

Maksimov,

Ushakov,

Gubkin

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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Recent advances in the study of cobaltites have unveiled their potential as a promising platform for realizing Kitaev physics in honeycomb systems and the Ising model in weakly coupled chain materials. In this manuscript, we explore the magnetic properties of pyroxene SrCoGe 2 O 6 using a combination of neutron scattering, ab initio methods, and linear spin-wave theory. Through careful examination of inelastic neutron scattering powder spectra, we propose a modified Kitaev model to accurately describe the twisted chains of edge-sharing octahedra surrounding Co 2 + ions. The extended Kitaev–Heisenberg model, including a significant anisotropic bond-dependent exchange term with K / | J | = 0.96 , is identified as the key descriptor of the magnetic interactions in SrCoGe 2 O 6 . Furthermore, our heat capacity measurements reveal an effect of an external magnetic field (approximately 13 T) which shifts the system from a fragile antiferromagnetic ordering with T N = 9 K to a field-induced state. We argue that pyroxenes, particularly those modified by substituting Ge with Si and its less extended p orbitals, emerge as a platform for the Kitaev model. This opens up possibilities for advancing our understanding of Kitaev physics.

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Cobalt-based pyroxenes: A new playground for Kitaev physics

Maksimov,

Ushakov,

Gubkin

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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Topological phase diagrams of in-plane field polarized Kitaev magnets

Chern,

Castelnovo

2024

Phys. Rev. B

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While the existence of a magnetic field induced quantum spin liquid in Kitaev magnets remains under debate, its topological properties often extend to proximal phases where they can lead to unusual behaviors of both fundamental and applied interests. Subjecting a generic nearest-neighbor spin model of Kitaev magnets to a sufficiently strong in-plane magnetic field, we study the resulting polarized phase and the associated magnon excitations. In contrast to the case of an out-of-plane magnetic field where the magnon band topology is enforced by symmetry, we find that it is possible for topologically trivial and nontrivial parameter regimes to coexist under in-plane magnetic fields. We map out the topological phase diagrams of the magnon bands, revealing a rich pattern of variation of the Chern number over the parameter space and the field angle. We further compute the magnon thermal Hall conductivity as a weighted summation of Berry curvatures, and discuss experimental implications of our results to planar thermal Hall effects in Kitaev magnets. Published by the American Physical Society 2024

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Transforming from Kitaev to Disguised Ising Chain: Application to CoNb2O6

Churchill,

Kee

2024

Phys. Rev. Lett.

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Magnon interactions in the quantum paramagnetic phase of CoNb2O6

Cited by 3 publications

References 81 publications

Cobalt-based pyroxenes: A new playground for Kitaev physics

Cobalt-based pyroxenes: A new playground for Kitaev physics

Topological phase diagrams of in-plane field polarized Kitaev magnets

Transforming from Kitaev to Disguised Ising Chain: Application to CoNb2O6

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