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- W4281706098 abstract "We investigate the magnetic excitations of the hyperhoneycomb Kitaev magnet $ensuremath{beta}text{ensuremath{-}}{text{Li}}_{2}{text{IrO}}_{3}$ by means of inelastic Raman scattering. The spectra exhibit the coexistence of a broad scattering continuum and two sharp low-energy peaks at 2.5 and 3 meV, with a distinctive polarization dependence. While the continuum is suggestive of fractional quasiparticles emerging from a proximate quantum spin liquid phase, the sharp peaks provide the first experimental signature of the ``non-Loudon- Fleury'' one-magnon scattering processes proposed recently [Yang et al., Phys. Rev. B 104, 144412 (2021)]. The corresponding microscopic mechanism is similar to the one leading to the symmetric off-diagonal exchange interaction $mathrm{ensuremath{Gamma}}$ (because it involves a combination of both direct and ligand-mediated exchange paths) but is otherwise completely unexpected within the traditional Loudon-Fleury theory of Raman scattering. The present experimental verification therefore calls for a drastic reevaluation of Raman scattering in similar systems with strong spin-orbit coupling and multiple exchange paths." @default.
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- W4281706098 date "2022-06-02" @default.
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- W4281706098 title "Signatures of non-Loudon-Fleury Raman scattering in the Kitaev magnet <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>β</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mi>Li</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>IrO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>" @default.
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- W4281706098 doi "https://doi.org/10.1103/physrevb.105.l241101" @default.
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