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Spin dynamics in the distorted triangular lattice antiferromagnet alpha-SrCr2O4

Abstract : The spin dynamics in the distorted triangular lattice antiferromagnet alpha-SrCr2O4 has been investigated by inelastic neutron scattering on a single crystal. The spin wave dispersion has been mapped out in the (0 k l) and (h k 0) planes, and modeled by spin wave calculations, in order to determine the intraplane and interplane exchange couplings. Comparison with alpha-CaCr2O4 shows that, despite the smaller lattice distortion of alpha-SrCr2O4, the deviation from a perfect triangular lattice still affects the spin dynamics of the Sr compound, with a soft mode, similar to the one observed in the Ca counterpart, being observed in (020). Although alpha-SrCr2O4 is further away from a magnetic phase boundary than its Ca counterpart, its dynamic magnetic properties still show intriguing features, which are discussed as quantum fluctuations arising from a two-magnon continuum.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02175392
Contributor : Elisabeth van T Hof <>
Submitted on : Friday, July 5, 2019 - 5:00:11 PM
Last modification on : Wednesday, October 14, 2020 - 2:54:02 PM

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M. Songvilay, S. Petit, E. Suard, Christine Martin, F. Damay. Spin dynamics in the distorted triangular lattice antiferromagnet alpha-SrCr2O4. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2017, 96 (2), ⟨10.1103/PhysRevB.96.024416⟩. ⟨hal-02175392⟩

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